1. How do the number of craters on the surfaces of planetary objects determine the age of the surface?

2. Explain how we know there were two distinct cratering epochs on the Moon?

3. Why are we so fascinated by exploring the craters of a barren planet like Mercury?

4. What is "weird terrain" on Mercury?

5. Even though we have evidence of recent volcanic activity on Venus, why can't we be sure that there isn't any tectonics on Venus?

6. Explain how the runaway greenhouse effect on Venus works. Include the greenhouse gases in your explanation

7. There are three different types of plate zones on Earth (subduction, translational and divergent). Find 3 examples (google it) of each occuring on Earth and find examples that are unique and not discussed in class. This means finding examples other than pacific NW, california or Mid-atlantic ridge). Include in your description which plates and what is physically happening to each plate (ex. one is going north, the other is rotating clockwise and subducting under the other)

8. Here is a map of the distribution of impact craters on the Earth: EarthImpactDatabase. You should notice that the craters are not evenly distributed across the face of the Earth. Research why some areas don't have craters and be complete in your reasoning.

9. What physical evidence do we have that water existed (at least at one time) on Mars?

10. Why is liquid water not currently and abundantly present on the surface?