Answer:
The loss of farms during the Great Depression.
Explanation:
This phenomenom known as the "Dust Bowl" was one of the worst ecologic disasters of the 20th Century. During 1930's (and up to 1932 and 1939) droughts affected the plains and meadows extending from the Gulf of Mexico to Canada. The Dust Bowl effect was produced by persistent drought conditions, favoured by years of soil manipulation that left it vulnerable to the effects of wind. Since its humidity levels were almost zero, soil was lifted up by the wind in the form of big sand and dust clouds. The Dust Bowl multiplied the effects of the Great Depression in the zone and caused the greatest displacement of population during a short period of time in United States' history. Three million inhabitants left their farms during 1930's, and more than half a million emigrated to other States, especially to the west.
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Explanation:
A pile of oil soaked logs caught on fire. The media attention it gathered came to be known as Earth Day. (That was the first Earth Day.)
The leader who was put in jail for fighting apartheid in South Africa was "<span>Nelson Mandela," although it should be noted that other protestors were jailed for this cause as well. </span>
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