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Grade 8 · unit review

Review: Geological Time and Earth Change

Combine relative order, tectonics and bounded rate models.

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Bring the unit skills together

Use these 4 new cases to check your reasoning. Choices are temporary and are not saved to an account, sent to staff or recorded as school grades. Download your current review choices before leaving or reloading.

Unit review questions
1. Which scientific label fits the specifically described step or feature? Supplied case: Dike younger than rock it crosses.
Need a hint?
  • Look for the described feature: cutting feature formed after what it cuts.
  • Compare the given mechanism with the other labels; do not infer unmentioned events.
2. Supplied case 5: interval (million years)=12, using the explicitly named quantities. Years equal supplied million years multiplied by one million. What result follows?
Need a hint?
  • Years equal supplied million years multiplied by one million.
  • Do not confuse thousand and million.
3. Which scientific label fits the specifically described step or feature? Supplied case: Intrusion is younger than rock it cuts.
Need a hint?
  • Look for the described feature: which event came earlier.
  • Compare the given mechanism with the other labels; do not infer unmentioned events.
4. Which scientific label fits the specifically described step or feature? Supplied case: Coastal assets in a possible inundation zone.
Need a hint?
  • Look for the described feature: people or assets in affected area.
  • Compare the given mechanism with the other labels; do not infer unmentioned events.

The download contains your current choices and any checked feedback. Keep the separate transfer-task work in your own document; downloading its instructions does not mark it complete.

Use the skills in a new task

Create a four-panel explanation for “Geological Time and Earth Change” using one supplied case from each lesson. Include the observation, scientific mechanism or calculation, result and a limitation. You may draw and speak your explanation; all inputs are supplied.

Work on paper or in your own document. Explain the choices you made.

  • Use one supplied case from each of the four lessons.
  • Name the relevant structure, quantity or process in every panel.
  • Show calculations with units or a causal evidence chain.
  • Distinguish source facts from fictional classroom data.
  • State a model limit or a condition that would change the result.
Compare with a model response

Panel 1: In an undisturbed stack, layer P underlies Q and an intrusion cuts both. What order is supported? Which inference or prediction is best supported? Result: P then Q then the intrusion, without an exact numerical age.. Reasoning: Superposition and cross-cutting establish a relative sequence under the stated conditions. Model limitation: only the stated classroom boundary and supplied observations are established; unmeasured real-world performance remains unverified. Panel 2: Supplied case 1: interval (million years)=2, using the explicitly named quantities. Years equal supplied million years multiplied by one million. What result follows? Result: 2000000 years. Reasoning: Substitute the supplied values: (2)*1000000 = 2000000 years. Million means one million. A conversion is not an independent dating measurement. Model limitation: only the stated classroom boundary and supplied observations are established; unmeasured real-world performance remains unverified. Panel 3: Layer A underlies B in an undisturbed stack, with no isotope date. What follows? Which inference or prediction is best supported? Result: A is relatively older, but an exact numerical age is not supplied.. Reasoning: Order and numerical dating answer different questions. Model limitation: only the stated classroom boundary and supplied observations are established; unmeasured real-world performance remains unverified. Panel 4: A mapped active fault can produce shaking, but no exact event-time evidence is supplied. What is warranted? Which inference or prediction is best supported? Result: Hazard planning is justified without an exact earthquake prediction.. Reasoning: Hazard, exposure, vulnerability and precise prediction are distinct claims. Model limitation: only the stated classroom boundary and supplied observations are established; unmeasured real-world performance remains unverified.

A different response can also meet the criteria. Compare the evidence and reasoning, rather than copying the wording.