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.
Layers are deposited parallel to Earth’s surface. Younger layers are deposited on top of older layer
Surface Coal Mine Reclamation
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Correlations between scores on a psychology test and number of boiled kumquats eaten per month
Separation of variable number tandem repeat (VNTR) alleles after PCR amplification