chapter 12 TD

chapter 12 TD - I think the most interesting topic in this...

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I think the most interesting topic in this chapter is the earth¡¦s structure. The interior of earth is divine into three major zones, the core, the mantle, and the crust. When we walk on the street the land of soil and rock underneath out feet is a crust, crust floats on a mantle of partly melted and solid rock, which surround by hot core. The earth¡¦s innermost zone is the core; it is very hot and has a solid inner part. Mantel is a think solid zone surrounds the core and most of them are solid rock. The crust is the outermost and thinnest zone of the earth; the crust consists of the continental crust and oceanic crust. The General Mining Law of 1872 was designed to encourage people to explore on the hardrock minerals on the United States lands. Under this law, any person or corporation can file that he need a mining claim and get ownership of it, and it worked on any land in the US except for parks and the wilderness. If a person files the claim, he just paid a little bit money to own the land. The 1972 law was modified to
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This note was uploaded on 09/18/2009 for the course BIO 120 taught by Professor Staff during the Fall '07 term at USC.

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chapter 12 TD - I think the most interesting topic in this...

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