compostion - 95% igneous rock (or it's metamorphic equivalent) - e.g., basalt, granite, granitic gneiss, schist...
8 most abundant elements in crust = (99 weight % and approx. volume) O, Si, Al, Fe, Ca, Na, K, Mg
Most common crustal minerals are:
- aluminosilicates - e.g., K-feldspar (orthoclase) KAlSi3O8
- oxides - e.g., hematite Fe2O3
S, Ni, Fe = core
- from kimberlite pipes we can tell something about temperature and pressure deep within earth (contain olivine & pyroxene)
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