3rd grade ch. 4 lesson 4 how do environments change
Post on 13-Jun-2015
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Ch. 4 Lesson 4How do
environments change?
Living things cause change:
•example: beaver dams
Natural events cause change
•hurricanes change coastlines
Natural events cause change
•floods
Natural events cause change
•droughts
Mt. St. Helens eruptionMay 18, 1980
•volcanoesNatural events cause change
Natural events cause change
•lightning starts fires
decomposer•living thing that breaks down waste & living things that have died
decay•process of breaking down waste & living things that have died
•returns nutrients to soil
Living things cause change
Natural events cause change
Draw and color a picture of one way:
How to build a decomposition column
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