The forces that move tectonic plates push deep rocks up to Earth's surface, and also push rocks at Earth's surface down to great depths. Tectonic plate motion may also lead to volcanic activity.
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In the mid-twentieth century and corroborated ever since, researchers dredging the seafloor could not find any materials older than 180 million years.
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The surface of an ocean or sea: seafloor According to this theory, the Earth's crust is divided into a number of enormous plates that together form the continents and ocean floors and are supported by a warm, plastic "mantle" beneath the surface. Mr. Walter Sullivan
Deposits of common minerals like copper, zinc, nickel, gold, silver, and phosphorus can be found on the seafloor. These deposits are nodules on silt from the abyssal plain that are typically 3 to 10 centimeters (1 to 4 inches) in diameter and appear as crusts on volcanic and other rocks.
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Hot and dry in some places, but in other places it was full of life and water.
The caste system is a rigid social hierarchy based on ethnicity in Hindu society. A democracy is government by the people, where power is often exercised through elected representatives. In a caste system, certain voices are valued more than others, while in a pure democracy, all voices and votes are equal. The caste system is not a system of government, though, so it is inaccurate to make a comparison.