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What is 1 + 3?
a deep narrow valley with steep sides
a hill with a flat top
they are like mesas but smaller
slow wearing away from the land by water wind or ice
dry land where little rain falls
to change in order to survive in a (southwest) environment
a period of little or no rain
=2 of our country's largest producers of oil
underground layers of rock or sand that trap rain water
place where underground water comes to the surface
canal or pipe that carries water to farms or cities
a way to grow crops with only a small amount of rain water
a not very useful oil. it must be taken to a refinery
where the crude oil is refined into different parts
chemicals made of petroleum. (paint, ink in a pen, clothing, shoes)