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1 Life above the Sea â Life on the Aleutian Islands is abundant and the islands provide critical habitat for many seasonal animal visitors to the Bering Sea.  Minerals and Energy â Extraction of the natural resources of oil, natural gas, and gold have shaped the history of the region. Huge potential reserves exist today.
The Mantle is almost completely silicate, and is rich in magnesium. The minerals of olivine and pyroxene are most common, and an aluminum-bearing mineral. Earth has two types of crust - oceanic and continental. Oceanic crust is composed of basalt, the result of partial melting of the mantle. It is rich in Mg, Fe, Ca, Al which are in the minerals olivine, pyroxene plagioclase feldspar. Continental crust diverse, old, and composed of incompatible elements that do not fit well in the minerals stable in the mantle (K and Na).