How do we know what the Earth is made of and what are some methods we use to find out???

Question

List a website as a source, please! I really need help on this.
DUE TOMORROW!!!
(gosh I really should stop procrastinating...oh well guess I'll work on that later. :) lol!)

Answer 1

What is the Earth made of?
http://www.leo.lehigh.edu/envirosci/geology/penngeo/whatis/whatis.html

Chemical Structure of the Earth
http://www.earth.northwestern.edu/people/seth/202/lectures/Minerals/compintro.htm

Structure and composition of the Earth
http://www.amonline.net.au/geoscience/earth/structure.htm

The way we know what makes the earth, chemically speaking is to test for it. Such as the composition of the atmosphere is put through a mass spectrometer (http://answers.yahoo.com/question/index?qid=20060905084043AAQ20dx) this tells scientist exactly what elements are in the test sample and in what percent! We do the same for tests in the earth, of course there are abundant other tests to perform, both chemical and by hand, to tell us a more rounded story of the formation of the earth's history.

Answer 2

i hear that some infra red satelite scan the earth to do that, and managed to value every burried material on earth