Why are Mercury and the Moon so much more heavily cratered than the Earth? Expla
Why are Mercury and the Moon so much more heavily cratered than the Earth? Explain how crater counts tell us the age of a surface.
2)Go to the home page for NASA’s Mars Exploration Program, and look for the latest evidence concerning recent water flows on Mars. Write a few paragraphs describing the new evidence and what it tells us about the planet’s past.
