1. Why are the atmospheres of Venus and Mars mostly carbon dioxide? Why is the atmosphere of…

1. Why are the atmospheres of Venus and Mars mostly carbon dioxide? Why is the atmosphere of Venus very dense but the atmosphere of Mars is very thin? 2. Why did Venus suffer from the runaway greenhouse effect but Earth has avoided it so far? 3. What evidence indicates that there has been liquid water on Mars? 4. Why do astronomers conclude that the crust on Mars must be thicker than Earth’s crust?  

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