Where Does Soil Come From?

Trees come from seeds, and birds come from eggs, but where does all the soil and dirt come from?
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Second Grade Next Generation Science Standards
Disciplinary Core Ideas:
ESS1.C: The History of Planet Earth - Some events happen very quickly; others occur very slowly, over a time period much longer than one can observe (2-ESS1-1).
ESS2.A: Earth Materials and Systems - Wind and water can change the shape of the land (2-ESS2-1).
Performance Expectations:
2-ESS1-1. Use information from several sources to provide evidence that Earth events can occur quickly or slowly.
2-ESS2-1. Compare multiple solutions designed to slow or prevent wind or water from changing the shape of the land.
SOURCES:
www.soils4kids...
www.qld.gov.au....
sciencing.com/...
www.geolsoc.or...
www.geolsoc.or...
oceanservice.n...
people.ku.edu/~...
www.nrcs.usda....
vro.agriculture...
www.nrcs.usda.....
www.geolsoc.or...