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Structure of the Earth.
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Earth, Interior Structure
It is 3,950 miles (6,370 km) from the earth's surface to its center. The rock units and layers near the surface are understood from direct observation, core samples, a...
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Earth's Core
If it were possible to drill a hole to the center of the Earth, about 1,800 mi (2,900 km) below the surface the drill bit would reach the Earth's core. First the drill would bore through ...
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Geology is the science of the study of the structures of the earth and the processes that affect those structures. Scientists who study the earth are known as ¡§geologists.¡¨ O...
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Earth, Interior Structure
Earth's Core
Layers of the Earth
