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What Caused the Dust Bowl?

science.howstuffworks.com/environmental/green-science/dust-bowl-cause.htm

What if the land you relied upon simply blew away? In the 1930s, poor stewardship and crushing drought created black blizzards and an internal American exodus known as the Dust Bowl.

How Tunnels Work

science.howstuffworks.com/engineering/structural/tunnel.htm

Constructing a tunnel is one of the most complex challenges in the field of civil engineering. Learn about the basics behind tunnels.

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