Plate Tectonics

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According to the theory of , Earth’s crust and part of the upper are broken into , or sections, that move around on a plastic like layer of the mantle called the .

are large sections of Earth’s crust and upper .

The crust and the rigid upper mantle form the .

The is the top edge of the mantle. It is soft and . The slides on top of it.

Plates can move closer together and , or collide. They also can pull or slide one another.

The area where two plates meet is called a .

When two plates are moving , the area between them is called a boundary.

The between the North American and European plates is called the . It is a midocean ridge.

When two plates converge, or , they form a boundary.

The area where an subducts (or sinks) into the mantle is called a .

As the plate into the mantle, it begins to .

Subduction zones occur at boundaries.

Volcanoes form above these zones.

At a boundary between and continental plates, the denser plate will under the less dense continental plate.

When two plates or converge, they fold and to form . Earthquakes are common at these boundaries.

boundaries occur when two plates slide one another.

When one plate moves past another, occur.

The Fault in California is part of a plate boundary.