Earth's Surface Chapter 2 Review

6. A farmer plants different crops in a field
7. The continuous process of wearing down and carrying away rocks and sediment.
8. Soil that is made up of equal parts clay, sand and silt and is best for growing plants.
9. A dark colored substance that forms as plant and animal remains decay.
13. How well the soil supports plant growth.
14. The management of soil to limit its destruction.
15. The loose weathered material on Earth's surface in which plants can grow.
17. A material is full of tiny holes or air spaces allowing water or substances to pass through it.
19. Dead weeds and stalks of the previous year's crops are plowed into the ground.
21. Anything in the environment that humans use.

1. Water seeps into cracks and freezes and expands. Wedges of ice in rocks widen and deepen cracks.
2. The type of weathering that breaks down rock through chemical changes.
3. Farmers plow their fields along the curves of a slope.
4. The type of weathering in which rock is physically broken into smaller pieces.
5. A crumbly, dark brown soil that is a mixture of humus, clay, minerals and has a limited supply is an important resource for all living things on Earth.
10. Usually consists of clay, other particles of rock and small amounts of humus.
11. The organisms that break down the remains of other dead plants or animals.
12. The process that breaks down rock and other substances.
16. Pollutants like sulfur, carbon and nitrogen react with water vapor in the clouds.
18. The solid layer of rock beneath the soil.
20. Refers to the wearing away of rock by other rock particles rubbing against each other due to wind, water, ice and gravity.