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Water Lab9-12 · Water Lab: Evidence and mechanism investigation

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Structured investigationEarth and Space Science

Water Lab: Evidence and mechanism investigation

Water Lab focus: water cycling, watersheds, and system change. One changed variable must be separated from the controls.

Which measurements and controls support the strongest Grade 9 explanation of water cycling, watersheds, and system change?

CourseEarth and Space Science

RigorOn-level

Performance artifactEvidence-based laboratory report

Evidence minimum2 evidence forms

Connect a controlled measurement and its uncertainty to a qualified causal model.

Earth system
scale
rate
evidence

1Frame model
2Predict
3Investigate
4Analyze uncertainty
5Revise
6Defend
7Transfer

Model

Variables, controls, and causal model

Run 3 controlled trials. Record the changed variable, controls, measured response, and uncertainty before choosing a mechanism.

Keep fixed: starting system state and observation interval
Measure: System pattern
Uncertainty: Use repeated trials and report the observed range before comparing models.
Model limit: The Water Lab model supports claims only within the tested variables and boundary conditions.

Model forcing50%Response lag28%

Select the causal model that can be distinguished through a controlled comparison.

Evidence

Dataset and uncertainty

Commit a falsifiable model and run the repeated trials to generate the dataset.

Evidence-based laboratory report

reproducible method
analyzed dataset
uncertainty statement
qualified causal model

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