​A man-made system for moving water from its source to where it can be used for growing crops

Where can you find irrigation around Columbus?

Irrigation

​The presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects.

​What causes pollution with body of waters?

Pollution

​ The process by which a desert spreads

How do you think desertification happens?

Desertification

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exchange (something) for something else, typically as a commercial transaction.

"they trade goods for services"

​Share a time recently in which you traded something

Trade

the upper layer of earth in which plants grow, a black or dark brown material typically consisting of a mixture of organic remains, clay, and rock particles.

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What can make soil better?

​Soil

​Removal of trees and other vegetation to make land available for other uses

What machines are used for deforestation?

​Deforestation