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The upper part of the Earth's mantle, extending from a depth of about 75 km (46.5 mi) to about 200 km (124 mi). The asthenosphere lies beneath the lithosphere and consists of partially molten rock. Seismic waves passing through this layer are significantly slowed.

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fault line. Evidence of a fault line. Licensed from iStockPhoto. noun. The definitionof a fault line is a break or fracture in the ground that occurs when the Earth's tectonic plates move or shift and are areas where earthquakes are likely to occur.

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The final type of boundary is one where the two plates slide against each other in a sideways motion. Theseboundaries between plates is referred to as transform boundaries. As two plates slide past one another, in atransform boundary, neither plate is added to at theboundary, nor destroyed.

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tectonic boundary where two plates are moving away from each other and new crust is forming from magma that rises to the Earth's surface between the two plates.

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tectonic boundary where two plates are moving away from each other and new crust is forming from magma that rises to the Earth's surface between the two plates.

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a mid-ocean ridge, a divergent tectonic plate or constructive plate boundary located along the floor of theAtlantic Ocean, and part of the longest mountain range in the world.

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a mid-ocean ridge, a divergent tectonic plate or constructive plate boundary located along the floor of theAtlantic Ocean, and part of the longest mountain range in the world.

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Subduction is a geological term for one of Earth's tectonic plates sinking under another. When this happens, we can get earthquakes, volcanoes, and a recycling of Earth's rocks.

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A term, no longer used by geologists, that refers to the fact that continents are not stationary, but move across the Earth's surface.Continental drift is one feature of the modern theory of plate tectonics.

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a theory explaining the structure of the earth's crust and many associated phenomena as resulting from the interaction of rigid lithospheric plates that move slowly over the underlying mantle