Earth's crust

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  • earth's crust
definition
  • The outer layers of the Earth's structure, varying between 6 and 48 km in thickness, and comprising all the material above the Mohorovicic Discontinuity (a seismic discontinuity occurring between the crust of the earth and the underlying mantle; the discontinuity occurs at an average depth of 35 km below the continents and at about 10 km below the oceans). The earlier idea of a cool solid skin overlaying a hot molten interior has now been replaced by a concept of a crust composed of two shells: an inner basic unit composed of sima (oceanic crust) and an outer granitic unit composed of sial (continental crust).
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Abstract from DBPedia
    Earth's crust is Earth's thin outer shell of rock, regarding for less than 1% of Earth's radius and 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 lithosphere is broken into tectonic plates whose motion allows heat to escape from the interior of the Earth into space. 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 temperature of the crust increases with depth, reaching values typically in the range from about 100 °C (212 °F) to 600 °C (1,112 °F) at the boundary with the underlying mantle. The temperature increases by as much as 30 °C (54 °F) for every kilometer locally in the upper part of the crust

    地殻（ちかく、英: crust）は、天体の固体部分の表層部。マントルの上にあり、大気や海の下にある。 以下では、特に断らない限り、地球の地殻について述べる。

    (Source: http://dbpedia.org/resource/Earth's_crust)

    Earth's crust is Earth's thin outer shell of rock, regarding for less than 1% of Earth's radius and 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 lithosphere is broken into tectonic plates whose motion allows heat to escape from the interior of the Earth into space. 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 temperature of the crust increases with depth, reaching values typically in the range from about 100 °C (212 °F) to 600 °C (1,112 °F) at the boundary with the underlying mantle. The temperature increases by as much as 30 °C (54 °F) for every kilometer locally in the upper part of the crust

    地球の地殻（ちきゅうのちかく　英:Earth's crust）は、地球の表層部にある薄い地殻で、地球の体積の1%にも満たない。地殻と上部マントルからなる地球の層区分リソスフェアの頂部にある構造体である。リソスフェアは複数のプレートに分割されていて、その動きが熱を地球内部から宇宙へと逃がしている。 地殻はマントルの上にあって、組成は安定している。なぜなら上部マントルが橄欖岩で出来ており、地殻よりも著しく高密度なためである。地殻とマントルの境界は、地震波速度の対比によって慣習的に定義される境界のモホロビチッチ不連続面である。 地殻の温度は深くなるにつれ上昇し、下にあるマントルとの境界部では通常約100°Cから600°Cまでの範囲内にある値に達する。地殻上部では、局地的ながら1km毎に温度が30°C上昇することもある

    (Source: http://dbpedia.org/resource/Earth's_crust)