Lithosphere summary

A lithosphere is the rigid, outermost shell of a rocky planet, and can be identified on the basis of its mechanical properties. On Earth, it comprises the crust and the portion of the upper mantle that behaves elastically on time scales of thousands of years or greater. The outermost shell of a rocky planet is, the crust, defined on the basis of its chemistry and mineralogy
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A quick look at the plate tectonics and the lithosphere

plate tectonics

Earthquake summary

An earthquake is the result of a sudden release of energy in the Earth's crust that creates seismic activity. The seismicity, seismism or seismic activity of an area refers to the frequency, type and size of earthquakes experienced over a period of time.
Bill Nye the Science Guy episodes 2 - Earths Crust