It is the outermost layer of the earth's surface. The Earth’s crust is its lightest, most buoyant rock layer. Continental crust covers 41% of the Earth’s surface, though a quarter of that area is under the oceans. The continental crust is 20 to 80 kilometers thick. Its rocks hold four billion years of Earth history. The remainder of the Earth is covered by oceanic crust. The crust is made of relatively light elements, especially silica, aluminum and oxygen. It’s also highly variable in its thickness. crust is made of relatively light elements, especially silica, aluminum and oxygen. It’s also highly variable in its thickness.
Since we don't have the available answers, let's see what were the <u>main causes</u> of the Dust Bowl devastation:
I) Mechanization of agricultural operations. Because of World War I efforts food production had to grow which increased wheat prices. This caused an enormous increase in the size of farms and in the rhythm and size of their crops that weren't accompanied by adequate care of the soil.
II) Farming in the Great Plains. Because of several federal land acts since the 19th century, many farmers were settling in the plains believing rain would come once farming started. This and the belief in Manifest Destiny made people farm in regions where irrigation couldn't reach.
III) The Great Depression. In order to compensate for the decreasing wheat prices, farmers tried to plow up even more land and harvest bigger crops. This led to the plowing of native grassland that kept the soil stable.
IV) Drought. In 1931 started a drought caused by a lack of rain that would end only in 1939. This killed the crops and left the soil exposed. Without grassland and with the winds the soil was blown away in dust storms.
It Demonstrates the Importance of Trade.
Answer:
the rise and dominance of the Republican party
<span>Choice (e) is the most correct. Europeans, in general, are more pragmatic than Americans. They tend to see the shades of grey of an issue and can be moved to look at more sides of an issue than Americans, who tend to be immovable in their positions once they do form an opinion.</span>
