GEOSCI 100 Study Guide - Final Guide: Weathering, Point Bar, Krater
Document Summary
It probably formed when a primeval cloud of gas and dust condensed. Late heavy bombardment earth got hit by a body the size of mars hit earth. The impact sent a ton of debris into space. This impact tilted the earth and sped up its rotation. A large group of asteroids that impacted all the 4 smaller planets. This can be seen from the moon and its craters that it has. I would assume this is talking about the formation of the atmosphere and oceans being made. There are networks of dry river channels and valleys that mean water likely was there in the past. Rocks recovered from mars must have formed in water so water must have been once in abundance. There may be large amounts of ice around the polar ice caps. This occurred during the cambrian explosion where there were tons and tons of new animals.
