The Tennessee Valley Authority is a corporation that was established as part of FDR's New Deal programs. One of the purposes of this corporation was to avoid the excessive presence of private companies in the modernization of the valley.
The TVA provided people with many jobs during the Great Depression. However, it achieved more than this. The TVA managed the natural environment of the region by controlling flooding and erosion. It also increased industrial activity in the region by building dams and power plants.
The world biggest building is in Burj Khalifa
Mineral of volcanic origin with large crystals is formed by magma that cooled off deeper into the crust.
Explanation:
The rocks of volcanic origin are divided into two main categories by the place of formation, extrusive igneous rocks and intrusive igneous rocks. The extrusive igneous rocks are the ones that form on the surface or near the surface. The intrusive igneous rocks are the ones that form deeper into the crust.
The intrusive igneous rocks are formed by magma that has managed to penetrate the crust, but didn't managed to come to the surface. It started to cool off slowly over longer period of time, thus solidifying. Because the solidifying has been very slow, the minerals formed in this manner have big minerals, as they had time to grow.
Minerals of this type are:
- granite
- diorite
- peridotite
- gabro
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