for thousands of millions of years the earth has been changing, with cycles­ and one-off events such as an asteroid impact, super-volcano or a supernova explosion.
for thousands of millions of years the earth has been changing, with cycles­ and one-off events such as an asteroid impact, super-volcano or a supernova explosion.
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tectonics and erosion, volcanic eruptions, flooding, weathering, glaciation, the growth of coral reefs, and meteorite impacts are among the processes that constantly reshape earth's surface over geological time.