Word: mineralogist
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Dates: during 1970-1979
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...would probably have pulled more dense material to the side of the moon facing the earth. As a result the crust there would have been slightly squeezed and become thinner than that on the far side. Indeed, such an uneven distribution of crust was offered by University of Chicago Mineralogist Joseph Smith to explain the paucity of maria on the far side. These great lunar seas are believed to be vast upwellings of lava, perhaps from volcanic eruptions set off by the moon's collision with large asteroids. On the far side, where the crust is thicker, such impacts...