4-ESS2-1 Make observations and/or measurements to provide evidence of the effects of weathering or the rate of erosion by water, ice, wind, or vegetation.
Clarification Statement: Examples of variables to test could include angle of slope in the downhill movement of water, amount of vegetation, speed of wind, relative rate of deposition, cycles of freezing and thawing of water, cycles of heating and cooling, and volume of water flow.
Assessment Boundary: Assessment is limited to a single form of weathering or erosion.
This resource was not designed to build towards this performance expectation, but can be used to build towards it using the suggestions provided below.
Comments about Including the Performance Expectation
Observations of magnified rock/sand types in text would be enhanced if students could use hand lenses and microscopes to observe their own sand samples and make inferences as to their origins.