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.
Coral reefs are influenced by sea surface temperatures.
Mammals posses a number of physiological pathways related to stress. One example is the hypothalamic
Some Shapes of Planetary Nebulae
Three possible phylogenies for the australopithecines with Au. anamnesis as the stem ancestor and re
The impact of climate change is greater in some areas than in others
Pediatric Nomogram Used for Determining Body Surface Area