Motion - El Molino High School

Motion - El Molino High School

Essential Questions How does the movement of Earths tectonic plates result in many geologic features? What are the three types of plate boundaries and the features associated with each? What are the processes associated with subduction zones? Copyright McGraw-Hill Education Plate Boundaries Vocabulary Review

New mid-ocean ridge Copyright McGraw-Hill Education tectonic plate divergent boundary

rift valley convergent boundary subduction transform boundary Plate Boundaries Tectonic plates are huge pieces of crust and rigid upper mantle that fit together at their edges to cover Earths surface. Copyright McGraw-Hill Education Plate Boundaries

Theory of Plate Tectonics Plate tectonics is the theory that describes how tectonic plates move and shape Earths surface. They move in different directions and at different rates relative to one another, and they interact with one another at their boundaries. Copyright McGraw-Hill Education Plate Boundaries Divergent boundaries Regions where two tectonic plates are moving apart are called divergent boundaries.

Most divergent boundaries are found along the seafloor in rift valleys. The formation of new ocean crust at most divergent boundaries accounts for the high heat flow, volcanism, and earthquakes associated with these boundaries. Copyright McGraw-Hill Education Plate Boundaries Divergent boundaries Some divergent boundaries form on

continents. When continental crust begins to separate, the stretched crust forms a long, narrow depression called a rift valley. Copyright McGraw-Hill Education Plate Boundaries Convergent boundaries At convergent boundaries, two tectonic plates are moving toward each other. When two plates collide, the denser plate

eventually descends below the other, lessdense plate in a process called subduction. Copyright McGraw-Hill Education Plate Boundaries Convergent boundaries There are three types of convergent boundaries, classified according to the type of crust involved: oceanic-oceanic; oceanic-continental; and continental-continental The differences in density of the crustal material affect how they converge.

Copyright McGraw-Hill Education Plate Boundaries Convergent boundaries In the oceanic-oceanic convergent boundary, a subduction zone is formed when one oceanic plate, which is denser as a result of cooling, descends below another oceanic plate. The process of subduction creates an ocean trench. Copyright McGraw-Hill Education Plate Boundaries

Convergent boundaries In an oceanic-oceanic convergent boundary, water carried into Earth by the subducting plate lowers the melting temperature of the overlying mantle, causing it to melt. The molten material is less dense so it rises back to the surface, where it often erupts and forms an arc of volcanic islands that parallel the trench. Copyright McGraw-Hill Education Plate Boundaries

Convergent boundaries When an oceanic plate converges with a continental plate, the denser oceanic plate is subducted. Oceanic-continental convergence produces a trench and volcanic arc. The result is a mountain range with many volcanoes. Copyright McGraw-Hill Education Plate Boundaries Convergent boundaries

Continental-continental boundaries form when two continental plates collide, long after an oceanic plate has converged with a continental plate. This forms a vast mountain range, such as the Himalayas. Copyright McGraw-Hill Education Plate Boundaries Transform boundaries A region where two plates slide horizontally past each other is a

transform boundary. Copyright McGraw-Hill Education Plate Boundaries Transform boundaries Transform boundaries are characterized by long faults, sometimes hundreds of kilometers in length, and by shallow earthquakes. Most transform boundaries offset sections of ocean ridges. Sometimes transform boundaries occur on continents.

Copyright McGraw-Hill Education Plate Boundaries Review Essential Questions How does the movement of Earths tectonic plates result in many geologic features? What are the three types of plate boundaries and the features associated with each?

What are the processes associated with subduction zones? Vocabulary tectonic plate divergent boundary rift valley Copyright McGraw-Hill Education convergent boundary subduction

transform boundary Plate Boundaries

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