Where, I'm unsure, but when, I think I know. There is a theory that the first asteroid to hit Earth was actually a comet. It wiped out the dinosaurs.
The mountains have emerged where the tectonic plates meet. The collision of the tectonic plates can disrupt the earth causing earthquakes as well as the growth of a mountain. These mountains take awhile to become the giants they are.
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Most reptiles belong as crocodilians, turtles, lizards, and snakes.
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After when it erupts the lava runs similarly to water, to the lowest point, then it hardens to rock.
The top ten largest countries, in square kilometers