Pebbles and cobbles in a streambed are smooth and rounded as a result of the process of __________.

Weathering is...

Erosion is...

Weathering is the breaking down of rock into ___________.

_________is the movement of sediment from one place to another.

The dropping off of sediments in a new place is called __________.

What is the dark, organic material that helps make soil fertile?

What are the different layers of the soil profile called?

What is a primary ingredient of humus?

How do plants weather rocks?

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