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Unit 2 Lesson 6,7
Term | Definition |
---|---|
Earthquakes | are ground movements that occur when blocks of rock in earth move suddenly and release energy |
Focus | A place within earth along a fault at which the first motion of an earthquake occurs |
Epicenter | Directly above the focus on earth's surface |
Tectonic Plate Boundary | Where two or more tectonic plates meet |
Fault | A break in earth's along which blocks of rock move |
Deformation | Is the process by which rock becomes deformed and changes shape due to stress |
Elastic Rebound | The return of rock to it's original shape after elastic deformation |
Volcano | Is any place where gas, ash, or melted rock come out of the ground |
Magma | Melted rock is less dense than solid rock, so it rises toward the surface |
Lava | Is Magma that has reached earth's surface |
Vent | An opening at the surface of the earth through which volcanic material passes |
Tectonic Plates | Are giant sections of lithosphere on earth's surface |
Hot spot | A location where a column of extremely hot mantle rock, called a mantle plume, rises through the asthenosphere |