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Chapter 2

7th grade terms from Earth's Surface book.

What is erosion? movement of rock particles by wind, water, ice, or gravity.
What is weathering? process that breaks down rock and other substances at Earth's surface.
What is mechanical weathering? type of weathering in which rock is physically broken into smaller pieces.
What are examples of mechanical weathering? heating and cooling, abrasion, and freezing and thawing.
What is abrasion? grinding away of rock by rock particles carried by water, ice, wind, and gravity.
What is ice wedging? wedges of ice in rocks widen and deepen the cracks.
What is chemical weathering? process of breaking down rocks through chemical changes.
What are examples of chemical weathering? water, oxygen, carbon dioxide, and acid rain.
What does permeable mean? material is full of tiny, connected air spaces that allows water to seep through.
Why is soil important? everything that lives on land depends directly or indirectly on it.
When did the Dust Bowl take place? the 1930s
Where did the Dust Bowl occur? the Great Plains
What was the Dust Bowl? plowing removed the grass from the Great Plains, exposing the soil. A drought lead to the topsoil drying out, which turned to dust and blew away.
What is soil conservation? managing the soil to prevent its destruction.
What is contour plowing? practice of plowing fields along the curves of a slope.
What is conservation plowing? practice of disturbing the soil as little as possible, leaving dead weeds and stalks to return nutrients to the soil.
Created by: crumsey