1) The surface of Venus is 900ºF, or 480ºC, which is due to the Greenhouse Effect. On Venus?s surface, signs of chemical weathering are apparent. There used to be water on Venus?s surface but because water is less dense than carbon dioxide, the water floated above it. It was then split into hydrogen and oxygen by the UV radiation. There are two large plateaus on Venus. Aphrodite Terra is about half the size of …showed first 75 words of 413 total…

…showed last 75 words of 413 total…to it?s nearness tot he sun, Mercury cooled very slowly. This allowed plenty of time for the iron to settle to the center of the planet. This happened due to the pull of gravity. Mars, in contrast, cooled very quickly because it is more distant from the sun. The rapid cooling did not allow much time for the iron to settle to the planet?s center. This, in turn, made Mars? core less massive.