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According to the U.S. Geological Survey website, tectonic plates are massive, irregular-shaped slabs of solid rock, composed of oceanic and continental lithosphere. The continental crust is made up of lightweight mineral... More »

www.reference.com Science Earth Science

A plate boundary is a location where two tectonic plates meet. There are three different types of tectonic plate boundaries, which are defined by the relative motion of each plate. The three types of plate boundaries are... More »

www.reference.com Science Earth Science Plate Tectonics

Earth's tectonic plates move due to the movement of magma in the mantle underneath the crust. Extreme temperatures inside the planet's core cause a convection cycle in which hot magma rises to the surface and eventually ... More »

www.reference.com Science Earth Science Plate Tectonics
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Geological plates are enormous slabs of solid rock that make up the earth's crust and outermost layer, the lithosphere. They are more commonly referred to as tectonic plates. More »

www.reference.com Science Earth Science Plate Tectonics

According to the National Oceanographic and Atmospheric Administration, seafloor spreading is caused by the flow of plastic mantle rock beneath the Earth's oceanic crust. These flows force the seafloor apart, allowing pr... More »

www.reference.com Science Earth Science

The four spheres of the Earth are the atmosphere, the biosphere, the hydrosphere and the lithosphere. Each of these spheres is considered by scientists as interconnected in a greater geosphere that harbors all terrestria... More »

www.reference.com Science Earth Science

The upper mantle forms part of the Earth's lithosphere, where earthquakes and volcanic activities frequently occur along plate boundaries. The upper mantle is separated from the crust by the Mohorivicic discontinuity, co... More »

www.reference.com Science Earth Science