Earth's mantle
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Earth's mantle is a layer of silicate rock between the crust and the outer core. It has a mass of 4.01×1024 kg and makes up 86% of the mass of Earth. It has a thickness of 2,900 kilometers making up a
Green xenoliths of peridotite from the mantle are surrounded by black volcanic lava. These peridotite xenoliths were carried upward from the mantle by molten magma during a volcanic eruption in Arizona.
Mohorovičić discontinuity
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The Mohorovičić discontinuity, usually called the Moho discontinuity, Moho boundary, or just Moho, is the boundary between the crust and the mantle of Earth. It is defined by the distinct change in ve
Earth's mantle
…The Earth's mantle is divided into three major layers defined by sudden changes in seismic velocity: the upper mantle (starting at the Moho, or base of the crust around 7 to 35 km [4.3 to 21.7 mi] downward to 410 km [250 mi]) the transition zone (approximately 410–660 km [250–410 mi]), in which wadsleyite…
Ordovician ophiolite in Gros Morne National Park, Newfoundland. This rock, which formed the Ordovician Moho, is exposed on the surface.