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Unformatted text preview: b) Oceanic crust is only 7 to 10 km thick, while continental crust is 35 to 40 km thick. Oceanic crust consists of a layer of basalt and gabbro, while continental crust has a great variety of rock types such as mafic to felsic. The oceanic crust less than 200 million years old while the continental crust is over 200 million years old. c) The outer core of earth is liquid. 4. a) The cause of the earths magnetic field is the liquid outer core since the flow of iron alloy creates an electromagnet for the earth. b) On Other Page c)...
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- Winter '10