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Download 6.5 NOTES What causes plate tectonics? Objective: Describe the
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6.5 NOTES What causes plate tectonics? Objective: Describe the causes of plate tectonics CONVECTION CURRENT is the movement of a gas or a liquid caused by differences in temperature and density. For example, warm air rises, and cool air sinks. Convection currents in the upper mantle cause the tectonic plates to move. The cooler mantle sinks closer to the core, heats up, and then rises. The process repeats in an endless cycle, carrying the plates along like a package on a conveyor belt. PLATE BOUNDARIES AND MOVEMENTS The place where 2 plates meet is called a plate boundary. There are three different kinds of plate boundaries: transform, convergent, and divergent. Transform boundariesTwo plates slide past each other, causing earthquakes Convergent boundariesPlates move toward each other. When oceanic crust meets continental crust, the denser oceanic crust slides under the continental crust. This produces a subduction zone. If two continental plates meet, the crust crumples upward, forming a mountain Divergent boundariesTwo plates move apart, sometimes forming rift valleys