: Paléoclimatologie: Earth's crust

constituent of the planet Earth > lithosphere > Earth's crust

Earth's crust

Earth's crust is a thin shell on the outside of Earth, accounting for less than 1% of Earth's volume. It is the top component of the lithosphere, a division of Earth's layers that includes the crust and the upper part of the mantle. The crust lies on top of the mantle, a configuration that is stable because the upper mantle is made of peridotite and is therefore significantly denser than the crust. The boundary between the crust and mantle is conventionally placed at the Mohorovičić discontinuity, a boundary defined by a contrast in seismic velocity. The crust of Earth is of two distinct types: oceanic (5 km to 10 km thick and composed primarily of denser, more mafic rocks, such as basalt, diabase, and gabbro) and continental (30 km to 50 km thick and mostly composed of less dense, more felsic rocks, such as granite). (Adapted from: https://en.wikipedia.org/wiki/Earth%27s_crust)

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