astronomy hw 5 - nebula 3 The third is that the moon formed...

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physics 115 1. Tides are explained by the moon's gravitational pull on the Earth. The moon's gravity pulls on the Earth, and the water on it, but the force varies. The variation causes water on the side of the Earth farthest from the moon to lag behind, while water on the side closest to the moon is pulled strongly by the moon's gravity. 2. maria is cooled basalt, and the far side of the moon is comprised mostly of highlands and few maria. The maria were formed when giant asteroids punctured the moon's crust, allowing molten rock to escape. 3. 1) The first theory is that the moon was spun off from the Earth when the Earth was very new and rotating rapidly on its axis. 2) The second is that the Earth and moon were created at the same time from a cloud of gas and solid particles, known as the primordial solar
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Unformatted text preview: nebula. 3) The third is that the moon formed at a different place in the solar system and when its orbit came close to the Earth, it was pulled into a permanent orbit. 4) The final theory, and the one that best fits the present data, is the giant impact theory. This is the theory that the Earth was struck by a large body, approximately the size of Mars, during the heavy bombardment period. This impact knocked a chunk off of the Earth which began to orbit it, and eventually came to be known as the moon. 4. On Earth, excess of CO2 was scrubbed out of the atmosphere by rain and deposited in carbonate rocks. Because Venus does not have rains, the CO2 remained in its atmosphere....
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