Comment: 25:30 - 26:05 (00:35)
Source: Annenberg/CPB Resources - Earth Revealed - 14. Intrusive Igneous Rocks
Keywords: heat, intrusion, "igneous rock", granite, sediment, continent, ocean, crust, gabbro, basalt, mantle, ultramafic, planet, "Solar System", "James Sadd"
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Our transcription: Throughout geologic time, the great heat generated within the interior of the Earth has caused rocks to melt.
Most of the Earth is composed of intrusive igneous rock.
Continents are largely masses of granitic rock beneath a thick blanket of soil and sediment.
Oceanic crust is mostly gabbro coated with basalt and mud.
Even the rocks of the Earth's mantle were formed from the slow cooling of ultramafic magma.
And so far, evidence from the interior planets of our solar system indicate that they, too, formed in a similar way.
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Geology School Keywords
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