Earth and Space Systems: Patterns, Processes, and Change

Your child builds models — physical ones with balls and flashlights, and diagrams — that have to explain three things at once: why we have day and night, why the moon seems to change shape, and why we have seasons. The point isn't matching a textbook picture, it's building something that holds up against all three patterns simultaneously.

1. Earth's rotation as the cause of day/night and the apparent daily motion of the sun and stars+

   Given a diagram of Earth on its axis with a light source, students state which side is in daytime and predict how that will change as Earth rotates.

2. The taught label pairs for rotation (spin, ~24 hr, day/night) and revolution (orbit, ~365 days, year), as demonstrated+

   Given the exact period and visible effect pairs shown in the Day 4 globe-and-lamp demonstration (spin/~24 hr/day-night; walk-around/~365 days/year), students label each pair as rotation or revolution.

3. The distinction between rotation (spin on an axis, ~24 hr, causes day/night) and revolution (orbit around another body, ~365 days, causes year)+

   Students distinguish rotation from revolution using the period and the visible effect of each as the distinguishing features, for pairs not seen during instruction.

4. Moon phases as a function of the moon's orbital position relative to sun and Earth, not a shadow+

   Students explain why the moon shows phases by relating the moon's position relative to the sun and Earth to the portion of its lit half visible from Earth.

5. Prediction of a specific moon phase from an orbital-position diagram+

   Students predict the moon phase visible on a given date, given the moon's position in its orbit on a diagram not seen in instruction.

6. Seasons as a function of axial tilt affecting sunlight angle and day length, not orbital distance+

   Students explain why seasons result from axial tilt and the angle/duration of sunlight, not Earth's distance from the sun.

7. The opposite-season relationship between hemispheres on a shared date+

   Students compare the Northern and Southern Hemisphere's seasons on the same calendar date and attribute the difference to which hemisphere is tilted toward the sun.

8. Scale (proportional size and distance) in the sun-Earth-moon system+

   Students build a physical scale model of the sun-Earth-moon system and identify which dimension (size or distance) their model most distorts.

9. Transfer of the position-relative-to-light-source reasoning structure to an unfamiliar orbiting body+

   Given an unfamiliar cyclic sky pattern from another body (e.g., a moon of another planet with a different orbital tilt), students generate a prediction for its phase-like pattern using the sun-Earth-moon reasoning structure.

10. Criteria for judging a model against multiple sky-pattern observations at once+

    Students evaluate two rival explanations for a given sky observation (e.g., 'the moon phase is Earth's shadow' vs. 'the moon phase is the moon's position') and judge which one is consistent with all three unit patterns.

11. Written mechanistic explanation of moon phase and seasonal cause, supported by a physical model+

    Students construct a written explanation that names the mechanism behind a predicted moon phase and a given hemisphere's season, using model evidence.

This is where 'why do things move the way they do in space' gets a real answer: gravity, which pulls harder with more mass and less distance, and inertia, which is why things in motion don't need a constant push to keep going. Your child builds a to-scale distance model of the solar system and looks at real data from planets found around other stars.

1. Gravity as a universal attractive force between masses+

   State that gravity is an attractive force between any two masses.

2. The inverse relationship between gravitational pull and distance+

   Explain why increasing the distance between two masses weakens gravitational pull, using the gravity-distance relationship.

3. Orbital motion as a balance of gravity and inertia+

   Differentiate between the role of gravity and the role of inertia in maintaining a stable orbit.

4. Scale factor calculation for solar-system distance modeling+

   Calculate a scale factor to build a to-scale model of solar system distances, given real astronomical distances in AU.

5. Orbital consequences of a change in central mass+

   Predict what would happen to Earth's orbit if the sun's mass changed, and justify the prediction using the gravity-mass-distance relationship.

6. Uneven heating due to sunlight angle on a curved surface+

   Explain why sunlight striking a sphere produces uneven heating across latitudes.

7. Transit-method light-curve data as evidence of an orbiting exoplanet+

   Interpret a transit light-curve dataset from an exoplanet survey to infer the presence and relative size of an orbiting planet.

8. Comparative pattern of planetary properties across our solar system and exoplanet system data+

   Compare our solar system's planet sizes, distances, and orbital periods to patterns found in a sample of confirmed exoplanetary systems, to evaluate whether our system is typical or unusual.

9. Application of the gravity-inertia orbital model to an unfamiliar orbital scenario+

   Justify a claim about whether a proposed change to a planet's orbit (a novel, untaught scenario) is physically plausible, using the gravity-mass-distance-inertia model.

Rock isn't one fixed thing — it's matter that cycles between three forms (igneous, sedimentary, metamorphic) depending on heat, pressure, and time. Your child builds a layered model of Earth's inside (crust, mantle, core) sorted by density and temperature, classifies real rock samples, and reads rock layers like a timeline.

1. Earth's layered interior (crust, mantle, core) as a density/temperature gradient+

   Given a description of Earth's interior, students explain why crust, mantle, and core separate by density and temperature rather than composition alone.

2. Diagnostic texture/grain evidence distinguishing the three rock classes+

   Students classify a rock sample as igneous, sedimentary, or metamorphic using texture and grain evidence, not color or size alone.

3. Conservation of chemical identity during rock transformation (heat/pressure vs. chemical change)+

   Students explain how heat and pressure transform one rock type into another without changing the rock's chemical composition.

4. Relative dating principles (superposition, cross-cutting relationships) applied to a strata diagram+

   Given a sequence of rock strata with no absolute dates, students infer the relative order of events (deposition, intrusion, erosion) that produced it.

5. The rock cycle as a structure: inputs, transformation, timescale, energy source+

   Students construct a rock-cycle diagram that names inputs, transformation processes, timescale, and energy source for each pathway.

6. Application of the rock-cycle structure to a novel, multi-step formation scenario+

   Given a completely unfamiliar rock photo with a written formation history (e.g., volcanic ash compacted underwater then buried and heated), students predict which rock class results and justify using the cycle structure.

7. Generalizable structure of matter-cycling systems beyond the rock cycle+

   Students compare the rock cycle and a hypothetical alien planet's 'metal cycle' (given as an unfamiliar analog system) to identify which structural features (inputs, transformation, timescale, energy source) generalize across any matter-cycling system.

8. Names of the three rock classes and three interior layers+

   Students recall the three main rock classes and the name of Earth's three interior layers on demand.

9. Validity of pathway connections in a constructed rock-cycle diagram+

   Students critique a peer's rock-cycle diagram for whether pathways correctly connect processes to rock types, identifying any pathway that skips a required transformation step.

This is the 'why' behind continents drifting, mountains rising, and earthquakes and volcanoes clustering in lines: slow-motion currents in the mantle, driven by heat and density differences, dragging rigid plates around. Your child looks at the historical evidence that convinced scientists continents move, then learns to read real plate boundaries from earthquake and volcano data.

1. Convection as a density-driven process+

   Given a diagram of a heated liquid or the mantle, state that warmer, less dense material rises while cooler, denser material sinks.

2. The lithosphere as Earth's rigid outer shell broken into plates+

   Label the lithosphere, asthenosphere, and underlying mantle on a cross-section diagram of Earth, using the layered-Earth model from Unit 3.

3. Mantle convection as the mechanism driving plate motion+

   Explain how uneven heating of the mantle, combined with density differences, produces convection currents that move lithospheric plates.

4. Historical evidence for continental drift and plate tectonics+

   Compare two pieces of historical evidence (fossil/continent fit and seafloor magnetic striping) and explain what both reveal about continental movement.

5. The three plate boundary types and their diagnostic features+

   Classify a given plate boundary as convergent, divergent, or transform based on arrow direction and resulting landform in a diagram.

6. Boundary-type inference from indirect hazard and landform evidence+

   Given an unfamiliar location's earthquake depth pattern and landform, infer which type of plate boundary is most likely present, even without being told the plate names.

7. Rock cycle processes occurring at plate boundaries+

   Explain why the rock cycle (Unit 3) operates differently at a subduction zone versus a mid-ocean ridge, in terms of rock creation and destruction.

8. Global distribution pattern of earthquakes and volcanoes as evidence of plate boundaries+

   Given a real global dataset of earthquake and volcano coordinates never seen in class, plot the points and identify the pattern of clustering relative to plate boundaries.

9. A written scientific argument using historical evidence for continental drift+

   Construct a written argument, citing one specific piece of evidence, for why scientists became convinced continents move.

10. The epistemic status of plate tectonic theory (settled versus uncertain aspects)+

    Evaluate a claim that plate tectonics is 'settled science with no remaining uncertainty,' using specific examples of what is and is not well established.

This runs the rock cycle backward: whatever tectonics builds up, weathering breaks down in place, and erosion carries away. Your child separates weathering from erosion, ties gravity into rockfalls and rivers, and runs a hands-on stream-table experiment with slope and water to see erosion happen in miniature.

1. The distinction between weathering and erosion+

   State the difference between weathering (breakdown of rock in place) and erosion (transport of the broken material) using a labeled example.

2. Surface-change scenarios sorted by process type+

   Classify given surface-change scenarios (e.g., a crack widening in a rock, a boulder tumbling downhill, sand piling at a river mouth) as weathering, erosion, or deposition.

3. Gravity as the common driver of mass wasting, runoff, and river transport+

   Explain how gravity, introduced in Unit 2 as the force holding orbits, also drives mass wasting, runoff, and river transport on Earth's surface.

4. Physical vs. chemical weathering mechanisms+

   Compare the roles of physical and chemical weathering in breaking down the same rock sample, citing a mechanism for each.

5. The effect of hardness, climate, slope, and vegetation on erosion rate+

   Predict how a change in one variable: material hardness, climate, slope, or vegetation cover, will change a landscape's erosion rate, given a new scenario not used in instruction.

6. The student's own stream-table erosion data and deposition prediction+

   Construct an evidence-based written explanation of how slope and water volume affected erosion rate in the student's own stream-table data, and justify a prediction of the deposition location.

7. Deposition as the link between erosion and new sedimentary rock formation+

   Explain why eroded sediment deposited in layers can eventually become new sedimentary rock, connecting back to Unit 3's rock cycle diagram.

8. The weathering-erosion-deposition sequence applied to an unfamiliar landform+

   Given an unfamiliar landform (e.g., a hoodoo, a delta, a mesa) never discussed in class, generate a plausible multi-step explanation of the sequence of weathering, erosion, and deposition that could have produced it.

9. The claim that erosion is uniformly destructive+

   Critique a claim that 'erosion is always bad and should be stopped' using evidence about landscapes erosion also creates.

10. Definitions of weathering, erosion, and deposition+

    Recall the definitions of weathering, erosion, and deposition from memory without a word bank.

Your child looks at how water moves — evaporating, condensing, falling as rain, soaking in, running off — on a timescale of days rather than the rock cycle's ages. The twist is they have to compare it directly to the rock cycle using the same four-part structure: what goes in, what changes it, how long it takes, what powers it.

1. The four-part structural frame (inputs, transformation, timescale, energy source) used to describe the rock cycle+

   Given a rock-cycle diagram from Unit 3, students recall its four structural elements: inputs, transformation, timescale, and energy source.

2. The five named transformation/transport steps of the water cycle+

   Students label evaporation, condensation, precipitation, infiltration, and runoff on an unlabeled diagram of the water cycle.

3. The sun as the energy source for evaporation, contrasted with Earth's internal heat as the rock cycle's driver+

   Students explain why the sun's energy, not Earth's internal heat, drives evaporation in the water cycle.

4. The structural correspondence and divergence between the water cycle and the rock cycle+

   Students compare the water cycle and the rock cycle using the four-part structural frame, identifying where each pair of steps matches by role and where the analogy breaks down.

5. The numeric distribution of Earth's water across ocean, ice, groundwater, and surface freshwater reservoirs+

   Students calculate the percentage of Earth's total water that is fresh AND accessible, using given data on reservoir volumes.

6. Observable evidence (droplets, fogging, water level change) distinguishing evaporation from condensation in a closed system+

   Students infer, from a sealed-bag model observed over several days, which surfaces show evidence of evaporation versus condensation.

7. Conservation of matter within a closed water-cycle model+

   Students design a claim, supported by evidence from their own sealed model, about whether their local water cycle model conserves matter.

8. Residence time as a function of energy source and system timescale, applied to a reservoir never discussed in class+

   Given a description of an unfamiliar reservoir (e.g., permafrost or a specific country's aquifer depletion), students predict its likely residence time and justify the prediction using the energy-source and timescale logic developed for the water and rock cycles.

9. Structural versus surface-feature justification within a peer's cycle-comparison argument+

   Students critique a peer's comparison paragraph, identifying whether each claimed match between a water-cycle step and a rock-cycle step is justified by structural role or only by surface similarity.

Your child works out why weather and climate get confused despite being genuinely different things, using uneven heating (Unit 2) and evaporation/condensation (Unit 6) to explain air masses, fronts, and storms. They also look at real temperature data to separate long-term pattern from short-term noise, and weigh evidence for human-caused climate change.

1. The timescale-based distinction between weather and climate+

   State the defining difference between weather and climate in terms of timescale, given a description of atmospheric conditions.

2. The four front types and their standard weather-map symbols+

   Recall the four front types (cold, warm, stationary, occluded) and match each to its standard map symbol, given a labeled reference diagram.

3. Uneven solar heating as the cause of air mass temperature and moisture differences+

   Explain how uneven solar heating by latitude, established in Unit 2, drives the temperature differences that create air masses.

4. Front movement and associated weather changes+

   Predict which way a front will move and what weather will follow, given a weather map showing air masses of different temperature and moisture.

5. Evaporation and condensation as mechanisms of cloud and precipitation formation at fronts+

   Explain how evaporation and condensation, established in Unit 6, connect to cloud formation along a front.

6. Global atmospheric and oceanic circulation patterns+

   Construct a model showing how uneven heating and Earth's rotation produce large-scale atmospheric and ocean circulation patterns.

7. Long-term temperature/ice-core records versus short-term weather data as distinct evidence types+

   Distinguish evidence of long-term climate pattern (temperature records, ice cores) from evidence of short-term weather variability, given a real dataset.

8. The logical error of using short-term weather to refute long-term climate trend claims+

   Evaluate a claim that a single cold week disproves long-term warming, using evidence about timescale and variability.

9. The relationship between century-scale global temperature trend and decade-scale regional variability+

   Compare a graph of global temperature over the past century to a graph of a single region's temperature over the past decade, explaining what each does and does not show about human-caused change.

10. A written evidence-based explanation of climate versus weather for a specific region+

    Write an evidence-based explanation distinguishing a region's climate from its current week's weather, citing uneven heating (Unit 2) and evaporation/condensation (Unit 6).

The last unit doesn't teach new Earth mechanisms — it takes plate tectonics, the water cycle, and weather/climate, all already learned, and asks your child to reason about human risk: what turns a hazard into a disaster, how mitigation and adaptation trade off, and what a real region should actually do about a real risk.

1. The underlying Earth-system mechanism (tectonic, water-cycle, or weather/climate) that produces a given hazard+

   Students correctly attribute a given natural hazard (earthquake, flood, or storm) to its underlying Earth-system mechanism (plate tectonics, water cycle, or weather/climate).

2. The distinction between hazard and disaster based on human exposure+

   Students distinguish a natural hazard from a disaster by explaining the role of human exposure in turning one into the other.

3. Risk as a combination of hazard likelihood, exposure, and vulnerability+

   Students explain how risk results from the combination of hazard likelihood, exposure, and vulnerability, using a specific region's data.

4. Mitigation versus adaptation as human hazard-response strategies, including tradeoffs+

   Students classify a real human response to a hazard as mitigation or adaptation and state a genuine tradeoff of that response.

5. Historical hazard-frequency data as evidence for future risk at a specific location+

   Students interpret a historical hazard-frequency dataset for an untaught region and infer what it implies about future risk.

6. An evidence-based mitigate/adapt/relocate recommendation for a novel, unstudied hazard-prone region+

   Given a region and hazard type never discussed in class, students identify the dominant hazard mechanism, estimate risk, and propose a mitigate/adapt/relocate recommendation with a data-based justification.

7. The logical connection between cited hazard/risk data and a written recommendation claim+

   Students critique a peer's draft recommendation by checking whether cited data actually supports the stated claim.

8. Tradeoffs (cost, safety, cultural ties, land availability) in the rebuild-after-repeat-hazard decision+

   Students generate an initial position on whether a community should rebuild after a repeat hazard, then revise it using a named tradeoff framework.

9. Human resource extraction as an intervention point in the rock cycle or water cycle system diagrams+

   Students identify a specific human resource use (water, mineral, or fossil fuel extraction) as an intervention point within a previously studied Earth-system diagram.