The asthenosphere consists of solid rock that is
- Slides: 34
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 deepocean trenches.
3 Types of Plate Boundaries Divergent Convergent Transform Divergent
3 Types of Boundaries Divergent boundary= two plates move apart • Magma rises and creates new crust or seafloor Causes: midocean 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
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. Helens
Oceanic vs. Oceanic • Two oceanic plates collide, one of the oceanic plates slides under the other. • also called a subduction zone
Oceanic vs. Oceanic Hawaiian Islands
Transform boundary • When two tectonic plates slide past each other horizontally Produces? Earthquakes
San Andreas Fault
New Madrid Fault
Examples of Convection DOS • Convection example • Convection in a room
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 • http: //education. sdsc. edu/optiputer/flash/convection. htm
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
- Can igneous rocks form metamorphic rocks
- Throw your hands up for the layers of the earth
- Asthenosphere
- Asthenosphere
- Three major layers of earth
- Cross section convergent plate boundary
- Earth asthenosphere
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