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Crust
The outer layer of the Earth. Made of low-density rock, it is the thinnest layer of the Earth’s entire center.

Crust
Word of the day
Oil >> A black, thick liquid used to produce fuel. It is formed from the decayed remains of plants or animals, which break down into liquids and gases under extreme heat and pressure under the Earth’s surface. Oil is extracted from the Earth through drilling and pumping.