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. Day and night from Earth's spin+

   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. Labeling rotation and revolution+

   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. Telling rotation from revolution+

   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. Why the moon has phases+

   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. Predicting the moon's phase+

   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. What causes the seasons+

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

7. Opposite seasons in each hemisphere+

   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. Sun, Earth and moon to scale+

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

9. Predicting phases on another moon+

   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. Judging models against sky patterns+

    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. Explaining phases and seasons in writing+

    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 pulls masses together+

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

2. Gravity weakens with distance+

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

3. Gravity and inertia in orbits+

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

4. Scale factors for solar system distances+

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

5. What if the sun's mass changed+

   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 from sunlight angle+

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

7. Detecting planets from transit light curves+

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

8. Is our solar system typical+

   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. Judging a strange orbit change+

   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 layers by density and temperature+

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

2. Identifying rocks by texture and grain+

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

3. Changing rocks without changing chemistry+

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

4. Relative dating of rock layers+

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

5. Diagramming the rock cycle+

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

6. Predicting a rock from its history+

   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. Rock cycle versus alien metal 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. Naming rock classes and Earth's layers+

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

9. Checking a 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. How density drives convection+

   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 and its plates+

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

3. How the mantle moves plates+

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

4. Fossils and magnetic stripes as evidence+

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

5. Three types of plate boundaries+

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

6. Identifying boundaries from earthquakes and landforms+

   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. The rock cycle 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. Mapping earthquakes and volcanoes worldwide+

   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. Writing an argument for continental drift+

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

10. What is settled in plate tectonics+

    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. Weathering versus erosion+

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

2. Sorting surface changes by process+

   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. How gravity shapes Earth's surface+

   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 and chemical weathering+

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

5. What changes the rate of erosion+

   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. Explaining your stream table results+

   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. How sediment becomes sedimentary rock+

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

8. Explaining 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. Is erosion always bad+

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

10. Defining 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. Four features of the rock cycle+

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

2. Labeling the water cycle steps+

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

3. Why the sun drives evaporation+

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

4. Comparing the water and rock cycles+

   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. Fresh water we can actually reach+

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

6. Evidence of evaporation and condensation+

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

7. Matter in a closed water cycle+

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

8. Predicting residence time in a new reservoir+

   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. Critiquing a peer's cycle comparison+

   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. Weather and climate by timescale+

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

2. Weather fronts and their 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 heating creates air masses+

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

4. Predicting weather as fronts move+

   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. How fronts form clouds and rain+

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

6. Global air and ocean circulation+

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

7. Climate records versus weather data+

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

8. One cold week versus warming trends+

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

9. Global trends versus regional variation+

   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. Explaining a region's climate and weather+

    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. Matching hazards to Earth processes+

   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. Natural hazards versus disasters+

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

3. What creates risk in a region+

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

4. Mitigation, adaptation, and their tradeoffs+

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

5. Using past hazards to judge risk+

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

6. Choosing to mitigate, adapt, or relocate+

   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. Checking data against a recommendation+

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

8. Should a community rebuild after disaster+

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

9. Where humans step into Earth systems+

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