The asthenosphere consists of solid rock that is flowing. But it’s not all flowing in the same direction.

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Presentation transcript:

The asthenosphere consists of solid rock that is flowing. But it’s not all flowing in the same direction.

Theory of Plate Tectonics Theory that pieces of lithosphere move around on top of the asthenosphere

Plate Boundaries The edges of different pieces of The lithosphere meet at lines called plate boundaries

Plate Boundaries Plate Videos

So the plates move. Now What? As the plates move, they produce changes in Earth’s surface, including volcanoes, earthquakes, mountain ranges, and deep- ocean trenches.

3 Types of Plate Boundaries Divergent Convergent Transform Divergent Transform

3 Types of Boundaries Divergent boundary= two plates move apart Magma rises and creates new crust or seafloor Causes: mid- ocean ridges, rift valleys, new crust, volcanoes

Divergent Boundaries © All Rights Reserved. Diverging Africa

Diverging Iceland

3 Types of Boundaries Convergent= when two tectonic plates push into one another.

Convergent Boundaries Continental vs. Continental Continental vs. Oceanic Oceanic vs. Oceanic

Continental vs. Continental When two continental crustal plates collide, the continents buckle upward and form mountains. Himalayas- Asia

Oceanic vs. Continental The oceanic plate slides under the continental plate. The continental crust crumbles and forms new mountains.

Oceanic vs. Continental Ex: Andes mtn in S. America Cascade Mtns. in N. America- Mt. St. HelensMt. St. Helens

Oceanic vs. Oceanic Two oceanic plates collide, one of the oceanic plates slides under the other. oceanic plates slides also called a subduction zone subduction zone

Hawaiian Islands Oceanic vs. Oceanic

Transform boundary When two tectonic plates slide past each other horizontally Produces? Earthquakes

San Andreas Fault

New Madrid Fault

Examples of Convection Convection exampleConvection example Convection in a roomConvection in a room DOS

How do the plates move? CONVECTION CURRENTS Hot material rises while cooler material near the surface sinks

How do the plates move? CONVECTION CURRENTS Hot material from deep within the Earth rises while cooler material near the surface sinks

Convection currents

How do we know? Sea-floor spreading =new ocean floor is created as two lithospheric plates pull away from one another. Sea-floor spreading

Seafloor spreading

The Plates Move… So what now? Which way? 50 million years