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Discuss erosion, evidence of erosion and causes of erosion. Students search for and describe erosion in the schoolyard. Describe the location of the erosion. Wrap-up: tour the schoolyard. Students share one example for each type of erosion.
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Students survey the school grounds, look for evidence of different types of erosion, and describe their findings. Wrap up: Discuss findings, where certain types of erosion are most likely to occur and why, etc.
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Students estimate and then measure (using number of hands) different objects around the schoolyard. Students compare their estimation to the actual measurement. Wrap up: Discuss student answers. How close were estimations? What other objects do you use to measure with? Discuss different units of measurement.
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Students learn to use a ratio to estimate height in this activity. Wrap up: Compare answers, which tree is the tallest/shortest, etc.
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Students use this activity sheet to guide them through estimating tree height. Wrap up: Compare tree heights, find the tallest/shortest trees in the schoolyard, etc.
