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Best Answer: .Lithosphere is the outermost layer of the earth's crust. Lithosphere is the only part of the earth that is accessible to us. Lithosphere is cold, solid and rigid whereas as Asthenosphere is partially molten. The lithosphere is broken up into large solid plates called tectonic plates. These tectonic plates move around which are the basis of plate tectonics. Pieces Of The Lithosphere. Plate tectonics. tectonic plates. it's tectonic plates notjust plates or tectonics trust me i have 102% in science. Tectonic plates.
Together the crust and upper mantle are called the lithosphere and they extend about 80 km deep. The lithosphere is broken into giant plates that fit around the globe like puzzle pieces. These puzzle pieces move a little bit each year as they slide on top of a somewhat fluid part of the mantle called the asthenosphere. All this moving rock can cause earthquakes. The asthenosphere is ductile and can be pushed and deformed like silly putty in response to the warmth of the Earth. These rocks actually flow, moving in response to the stresses placed upon them by the churning motions of the deep interior of the Earth.