GEOL101 pg 30-34 outline

GEOL101 pg 30-34 outline - disintegrated along with a large...

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January 20 – pg. 30-34 Differentiation of the Earth and formation of the Moon As large plantesimals formed, they began to heat up. 1) transformation of kinetic energy into thermal energy during collisions 2) decay of radioactive elements. In bodies whose temperature rose sufficiently to cause melting dense iron alloy separated out and sank to the center of the body, whereas lighter rocky materials remained in a shell surrounding the center. = DIFFERENTIATION. Protoplanets and large planetesimals developed internal layering. In the early days of solar system, planets continued to be bombarded by meteorites (SOLID OBJECTS FALLING FROM SPACE THAT LAND ON A PLANET). Pulverized the surface of the Earth and contributed to the heating of the planets. A protoplanets slammed into Earth. In the process, the colliding body
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Unformatted text preview: disintegrated, along with a large part of the Earths mantle. A ring of debris formed around the Earth, which at the time would have been covered with a sea of molten rock and quickly accreted to form the Moon. Its overall composition resembles the Earths mantle. The moon probably formed from the debris of a collision. Earth was fairly homogeneous at first, but when iron sank to the center, it differentiated into a metallic core surrounded by a rocky mantle. Why is the Earth Round? When a protoplanet gets big enough, gravity can change its shape. Once a planetesimal becomes big enough, the insides of the planet become warm and the rock becomes soft enough to flow in response to gravity. Also the gravitational force become stronger....
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