Earth Sciences 1086F/G Lecture Notes - Lecture 9: Giant-Impact Hypothesis, George Darwin, Igneous Rock
19 Dec 2017
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Intro to unit 3 the terrestrial planets. The solid, rocky surface of the terrestrial planets certainly characterize them, and the composition of that rocky" material is pretty much common to them all: a lot of si, o, al, Mg, s, fe and basalt (an igneous rock, the primary product of volcanic lava, fine grained, dark grey to black) The closer to the sun, the more often it will be bombarded with asteroids and comets. Mercury and venus do not have natural satellites, mars has 2. Earth has 1 (the moon: the moon is weird b/c: Core that amounts to 2-4% of its total mass, compared to 30% for earth"s core. Abnormally high angular momentum: in the 1970"s 3 hypothesis were suggested why the moon orbited earth (one of. Apollo"s mission was to find which one was right): Fission hypothesis - moon broke off from a rapidly spinning earth. First proposed 100 years ago by george darwin.
