PHYC 2451 Chapter Notes - Chapter 10: Late Heavy Bombardment, Geology Of The Moon, Impact Crater

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Appearance of the moon: the earth-facing side of the moon displays light-colored, heavily cratered highlands (older) and dark-colored, relatively younger, smooth-surfaced maria. Moon"s far side has almost no maria: virtually all lunar craters were caused by space debris striking the surface. There is no evidence of plate tectonic activity on the moon. Internal structure of the moon: analysis of seismic waves and other data indicates that the. Geologic history of the moon: the anorthositic crust exposed in the highlands was formed between 4. 3 and 4. 0 billion years ago. These weathering processes formed the moon"s regolith, or surface layer of powdered and fractured rock: all of the lunar rock samples are igneous rocks formed largely of the same minerals found in terrestrial rocks on earth. However, material in lunar rocks appears to have been exposed to higher temperatures than terrestrial rocks. Origin of the moon: the collisional ejection theory of the moon"s origin holds that the proto-

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