Planet Earth 13 - Chapter 13 Methods for studying the...

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Chapter 13 Methods for studying the past -Identifying ancient orogens -Recognizing growth of continents -Recognizing growth of continents -Recognizing past depositional environments -Recognizing past change in relative sea level -Recognizing positions of continents in the past -Recognizing past climates Hadeon Eon -Earth’s surface destroyed by meteorite bombardment produces heat Internal Differentiation: gravity pulled molten iron down to the center of the Earth, where it accumulated to form the core -Magma oceans w/ solid basalt floating about -Unbreathable atmosphere -methane, ammonia, sulfur dioxide, CO2 -much denser than present atmosphere Archaen Eon Protocontinents: block of crust composed of volcanic arcs & hot-spot volcanoes sutured together Craton: long-lived block of durable continental crust commonly found int hes table interior of a continent Gneiss: relicts of Archaen metamorphism in collisional zones Greenstone: metamorphosed relicts of ocean crust trapped between colliding blocks of basalts Granite: formed from magmas generated by the partial melting of the curst in continental
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