EESA06H3 Final: EESA06 Final Exam Ch4 Summary + 40 MCQ/T or F

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The interior of earth is studied indirectly by geophysics a study of seismic waves, gravity, Seismic reflection and seismic refraction can indicate the presence of boundaries between rock layers. Earth is divided into three major units the crust, the mantle, and the core. The crust beneath oceans is 7 km thick and made of basalt on top of gabbro. Continental crust is 30 to 50 km thick and consists of a crystalline basement of granite and gneiss (and other rocks) capped by sedimentary rocks. The mohorovic ic discontinuity separates the crust from the mantle. The mantle is a layer of solid rock 2,900 km thick and is probably composed of an ultramafic rock such as peridotite. Seismic waves show the mantle has a structure of concentric shells, perhaps caused by pressure transformations of minerals. The lithosphere, which forms plates, is made up of brittle crust and upper mantle.

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