losing to the desert: drought and desertification chapter 17

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Losing to the desert: Drought and Desertification Chapter 17

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Losing to the desert: Drought and Desertification

Chapter 17

Key words to understand:Term Meaning

Desertification

Drought

Sahara

Sahel

Population growth

Overgrazed

Over-cultivated

Famines

Migrate

Irrigation

Drought-resistant

Key words to LEARN:Term Meaning

Desertification The process by which land turns into desert

Drought Long rainless periods of time

Sahara The largest desert in Africa

Sahel An area of land across Africa just south of the Sahara desert

Population growth The number of people in an area increasing due to high birth rates and improved health care.

Overgrazed When animals eat grass too quickly for the land to recover.

Over-cultivated The growing and sowing of crops too quickly to allow the land to recover.

Famines When crops fail, people starve and many die

Migrate When people move from one place to another

Irrigation The artificial watering of land

Drought-resistant Crops that can survive long periods of time without water