Crust of the Earth | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-06-16

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Crust_(geology)


00:01:12 1 Types of crust
00:01:32 1.1 Primary crust / primordial crust
00:03:55 1.2 Secondary crust
00:04:44 1.3 Tertiary crust
00:05:54 2 Earth's crust
00:06:04 2.1 Structure
00:09:00 2.2 Composition
00:10:30 2.3 Formation and evolution
00:14:33 3 Moon's crust
00:17:56 4 See also



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SUMMARY
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In geology, the crust is the outermost solid shell of a rocky planet, dwarf planet, or natural satellite. It is usually distinguished from the underlying mantle by its chemical makeup; however, in the case of icy satellites, it may be distinguished based on its phase (solid crust vs. liquid mantle).
The crusts of Earth, Moon, Mercury, Venus, Mars, Io, and other planetary bodies formed via igneous processes, and were later modified by erosion, impact cratering, volcanism, and sedimentation.
Most terrestrial planets have fairly uniform crusts. Earth, however, has two distinct types: continental crust and oceanic crust. These two types have different chemical compositions and physical properties, and were formed by different geological processes.