Explain how we can estimate the geological age of a planetary ...

[natalie2426]

Explain how we can estimate the geological age of a planetary surface from its number of impact craters.
 
  What will be an ideal response?

Question 2

Describe several features on the Earth's crust explained by plate tectonics.
 
  What will be an ideal response?

[abctaiwan]

Answer to Question 1

Even though impacts still occur today, the vast majority of craters formed during the bombardment period that ended around 3.8 billion years ago. A surface region that is still saturated with craters must have remained essentially undisturbed for the last 3.8 billion years. In contrast, a surface region that has few craters indicates that the original craters must have been somehow erased since then.

Answer to Question 2

Mountain ranges, volcanic mountain chains, mid-ocean rifts, oceanic trenches, faults, earthquakes, and plate motion.