Astronomy HWK Assignment3

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                                                                                                                                                                           1. The Earth has had three distinct atmospheres over its life to date. Describe the composition of                   these atmospheres and when they occurred?
ASNSWER THE FOLLOWING QUESTIONS BELOW!!!!
 
 
 
 
2. The same process is responsible for the relatively young average age of rocks on the Earth and the fact that we have so few craters. Names this process and describe how it works.
 
3. What is the source of the magnetic field that we have on Earth? 
 
4. Describe the two of the most predominant physical features of Venus and their cause.
 
5. (a) What are the main indicators that there was once liquid surface water on Mars?
 

    (b) Describe and locate any current forms of water on Mars?

 

FROM BOOK "DISCOVERING THE UNIVERSE"

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