Oklahoma Science 4.ESS2.1
The Standard
Plan and conduct an investigation to gather evidence on the effects of water, ice, wind, and vegetation on the rate of weathering and erosion.
Oklahoma Academic Standards for Science (2026)
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students plan fair tests to see how water, ice, wind, and plants affect rock and soil. They measure changes over a set time and use the results to explain what happened.
What Mastery Looks Like
- A student can compare bare soil with soil covered by rooted grass while keeping the slope and water amount the same. They collect runoff for the same length of time, compare the sediment, and explain what the grass changed.
Common Misconceptions
- Students may call a cracked rock erosion, even though no material moved. They may think plants only protect rock and soil, though roots can split rock. They may compare tests with different amounts of water and treat the results as a fair comparison.
How to Assess It
- Exit ticket: Plan a test using two soil trays to find out whether grass slows erosion. Name what you would keep the same, what you would change, and how you would measure soil loss after two minutes.
Lesson moves
Ways to Teach It
Pour one cup of water over equal slopes of bare soil and rooted sod; catch runoff for two minutes and compare collected sediment.
Show photos of a frost-split rock and a muddy stream; ask which shows weathering, which shows erosion, and why.
Give pairs cards labeled windblown dust, ice-cracked rock, muddy runoff, and root-split stone; have them sort each as weathering or erosion.
Inspect photos of a roadside ditch before and after rain; mark soil loss and propose where grass could slow erosion.
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Printable 4.ESS2.1 Worksheet
A ready-to-print activity worksheet aligned to 4.ESS2.1, with an answer key for the teacher on its own page. No account needed.
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Related Standards
- EN.ESS2.5
Plan and conduct investigations of how the structure and resulting properties of water interact with the Earth's materials and surface processes.
- ES.ESS2.5
Plan and conduct investigations of how the structure and resulting properties of water interact with the Earth's materials and surface processes.
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