Geological time and radiometric dating

Continental lithosphere, because it is less dense, is more bouyant and is not easily subducted, or recycled back into the Earth's interior.

In this regard, the Earth, since the early Precambrian, has been divided into deep ocean basins (average depth 3.5 km) and high-standing continents (average elevation about 800 meters).The second goal is to illustrate the changing distribution of mountains, lowlands, shallow seas, and deep ocean basins through time.The past positions of the continents can be determined using the following five lines of evidence: paleomagnetism, linear magnetic anomalies, paleobiogeography, paleoclimatology, and geologic history.The ocean basins, on the other hand, are all less than 150 million years old.

Oceanic lithosphere, because it is more dense is continually recylced back into the interior of the Earth.The geological or deep time of Earth's past has been organized into various units according to events which took place in each period.

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