4th - SS - Ch. 9 - Lesson 1,2, 3, & Nigeria Vocabulary
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Created by:
mswildcat Plus on May 1, 2012
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14 terms
Terms | Definitions |
|---|---|
 mesa | a flat landform that rises steeply above the surrounding land; smaller than a plateau |
| butte | a flat-topped hill, smaller than a mesa |
| canyon | a deep narrow valley with steep sides |
| erosion | how water, wind, or ice slowly carry away soil and rock |
| adaptation | when a kind of animal or plant slowly changes over many years to survive in its environment |
| Dust Bowl | an area of the Great Plains that experienced terrible droughts and dust storms |
| aquifer | underground layers of rock or gravel that trap water causing people to dig wells to bring this water to the surface |
| dry farming | a way to grow crops with only rain water |
| plateau | a high, flat landform that rises steeply above the surrounding land |
| petroleum | a nonrenewable natural resource also called oil formed underground over millions of years from the remains of dead plants also called "black gold." |
| crude oil | oil that bubbles up from the ground and has not been refined |
| refinery | a factory where crude oil is refined, or separated into parts to be used |
| petrochemical | chemicals made from petroleum produced in refineries |
| international trade | countries buying and selling goods to each other |
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