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Earth Inside and Out


Online Resource, Article

James Hutton: The Founder of Modern Geology

Until the late 18th century, most people believed the Earth was about 6,000 years old. Hutton changed this belief by proposing that geologic forces operate at the same rate today as in the past.


Online Resource, Article

Inge Lehmann: Discoverer of the Earth's Inner Core

Each one of the thousands of earthquakes that occur every year offers a brief glimpse of what's happening deep inside the Earth. Lehmann used seismic signals to change our knowledge of the Earth's core.


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