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What is the central idea of paragraph 4?

The Dust Belt is a strip of dry land that covers many continents.

Droughts happen when there are long periods of time during which there is very little rainfall.

Dust storms are a problem not only in Africa and China but also in Australia and the United States.

A large part of Earth’s population is harmed when droughts cause farmable land to become unusable.

User Metadings
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Dust storms and droughts can be very harmful to not only the economy but to people as well.
User Jannes Carpentier
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