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Encyclopedia > Earth's crust
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Earth cutaway from core to exosphere. Partially to scale.

In geology, a crust is the outer layer of a planet, part of its lithosphere. Planetary crusts are generally composed of a less dense material than that of its deeper layers. The crust of the Earth is composed mainly of basalt and granite. It is cooler, harder and stronger than the deeper layers of the mantle and core. Earth, also known as the Earth or Terra, is the third planet outward from the Sun. ... The Congress of Racial Equality or CORE is a civil rights organization that played a pivotal role in the U.S. Civil Rights Movement of the 20th century. ... The exosphere (from the Greek words exo = out(side) and sphaira = ball) is the uppermost layer of the atmosphere. ... Geology (from Greek γη- (ge-, the earth) and λογος (logos, word, reason)) is the science and study of the Earth, its composition, structure, physical properties, history, and the processes that shape it. ... A planet (from the Greek πλανήτης, planetes or wanderers) is a body of considerable mass that orbits a star and that produces very little or no energy through nuclear fusion. ... The lithosphere (from the Greek for rocky sphere) is the solid outermost shell of a rocky planet. ... Density (symbol: ρ - Greek: rho) is a measure of mass per unit of volume. ... Earth, also known as the Earth or Terra, is the third planet outward from the Sun. ... Basalt Basalt is an extrusive igneous rock, sometimes porphyritic, and is often both fine-grained and dense. ... Granite - Wikipedia /**/ @import /skins/monobook/IE50Fixes. ... A Mantle is a piece of clothing, similar to a robe but open on the front side and often sleeveless. ... The Congress of Racial Equality or CORE is a civil rights organization that played a pivotal role in the U.S. Civil Rights Movement of the 20th century. ...


On partially-molten planets, such as Earth, the lithosphere is floating on fluid interior layers. Because of the partially-fluid upper mantle, or asthenosphere, underneath, floating lithospheres are often broken into tectonic plates that move. On Earth, the crust beneath the oceans is different from that of the continents. The oceanic crust (sima) is 5 to 10 km thick and is composed primarily of a dark, dense rock called basalt. The continental crust (sial) is 20-70 km deep and is composed mainly of a light-colored, less dense rock called granite. There are several meanings of float: an air-filled vessel that floats on water, such as some types of lifeboats buoyancy float (project management) floating currency floating exchange rate floating point, a datatype in computer science free float of company stock insurance (investable policyholder funds) root beer float: ice cream... FLUID widget list window FLUID (Fast Light User Interface Designer) is a graphical editor that is used to produce FLTK source code. ... The mantle is the layer in the structure of the Earth that lies directly under the Earths crust. ... The asthenosphere (from the Greek asthenia, weakness) is the region of the Earth between 100-200 km below the surface, but may extend as deep as 400 km. ... Categories: Geology stubs | Plate tectonics ... Oceanic crust is the part of Earths lithosphere which underlies the ocean basins. ... Basalt Basalt is an extrusive igneous rock, sometimes porphyritic, and is often both fine-grained and dense. ... The Continental Crust is the layer of granitic and sedimentary rock which forms the continents and the areas of shallow seabed close to their shores, known as continental shelves. ... Granite - Wikipedia /**/ @import /skins/monobook/IE50Fixes. ...


See also


  Results from FactBites:
 
Earth's Crust, Lithosphere and Asthenosphere (661 words)
Crust, the upper layer of the Earth, is not always the same.
Crust under the oceans, called oceanic crust, is much thinner than continental crust.
Crust under the oceans is only about 5 km thick while continental crust can be up to 65 km thick.
  More results at FactBites »

 
 

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