Clarification Statement - S.4.ESS.2.1.CS:
Examples of variables to test could include angle of slope in the downhill movement of water and/or loose Earth materials due to gravity, amount of vegetation, speed of wind, relative rate of deposition, cycles of freezing and thawing of water, cycles of

Assessment Boundary - S.4.ESS.2.1.AB:
Assessment is limited to a single form of weathering or erosion.

Science and Engineering Practices - 3-5.SEP3.1:
Make observations and/or measurements to produce data to serve as the basis for evidence for an explanation of a phenomenon or test a design solution

Disciplinary Core Ideas - S.4.ESS.2.1.DCI:
ESS2.A: Earth Materials and Systems •Rainfall helps to shape the land and affects the types of living things found in a region. Water, ice, wind, living organisms, and gravity break rocks, soils, and sediments into smaller particles and move them around. ESS2.E: Biogeology •Living things affect the physical characteristics of their regions.

Crosscutting Concepts - CC2.4:
Cause and effect relationships are routinely identified, tested, and used to explain change.