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History of life on Earth | Biology | Science | Khan Academy

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Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more. Khan Academy is a nonprofit with the mission of providing a free, world-class education for anyone, anywhere.

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public broadcasting service (tv network)

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evolutionary developmental biology (field of study)

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Use fossils, like clues buried inside of rocks, to unlock the history of life on our planet. Play the Evolution Lab: http://www.pbs.org/nova/labs/lab/evolution/

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We bet you thought that rocks are just rocks, but the truth is there are three different kinds of rocks. Learn the differences between sedimentary, metamorphic and igneous rocks.

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Earth geological and climatic history | Khan Academy

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Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more. Khan Academy is a nonprofit with the mission of providing a free, world-class education for anyone, anywhere.

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Earth's 4.6 billion-year history has distinct periods. Geologists use evidence in rock record to classify these.