The climate was an important cause<span> of the </span>dust bowl<span>. The climate of the Great Plain's region is dry and windy; winds reached the speed of 60 mph. Scientists believed that drought which </span>caused the dust bowl<span> to take place occurred because it happened same time as La Nina event in the Pacific Ocean.</span>
The large vertical structures are called Columns
<em>A. The attack on Jamestown colonists in 1622
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Henry David Thoreau is the answer