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geol - wed 17 jan physical geology deals with processes...

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wed 17 jan physical geology- deals with processes that oerateat or beneath the earths surface. its immensity(billions of yers) is difficult to grasp. geologist stud phenomena on very different time frames a) seconds- hours. earthquake shakes the universe is about 15 billion years old solar system is 4.5 billlion years old consits of sun and 9 planets cirling it 2 groups of planets a)terrestrial: small, rocky, dense-mercury venus earth mars b)jovian:large grassy light-jupiter satern uranis neptune our solar system formed from relatively cold material formed from nebula of gas and dust that undergoes accretion. gravitational attraction- the larger a body the more dust and gas it pulls in- accretion(fig1.3)most of the material goes to form the sun, left overts form planets, comets, meterorites. earth wrms up very rapidly. due to 1)accretin-collisons-al heating 2)compression -inne layers getting heated 3) decay od radio active materials inside the earth early eath became (partially) molten. Caused (in part) by collision with mars sized body; created the moon (fig 1.5) the started to cool down. rocks are very poor condutors of heat . once crust
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