Plate Boundaries

• Alfred Wegner came up with the theory

• Earth's Crust is broken into many Plates

  • Large Pieces of Rock

• Magma (Melted/Molten Rock) in the Mantle

• Heat from the core causes movement in the mantle

Sketch of boundary:
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Direction of movement:
plates pull away from each other.


Description / Features of plate boundary:
- new oceanic crust
-mountain ranges, Rift Valley (continent)
- Mid Ocean Ridge (ocean)

Examples

Mid Atlantic Ridge

Great African Rift Valley

Direction of movement:
plates slide past each other


Description / Features of plate boundary:
- earthquakes


Examples: San Andreas Fault (california)

Direction of movement:
plates push into each other


Description / Features of plate boundary:
- Mountains

​Sketch --> <--

Examples:
-Himalaya Mountains in Central Asia

-Western Andes Mountains in South America

Direction of movement:
plates push into each other and the denser crust goes under


Description / Features of plate boundary:
- Island Arcs (Volcanoes)
-Trench

Examples:

- Marianas Trench

-Aleutian Islands

Direction of movement:
plates push into each other and the denser Ocean crust goes under the continental crust


Description / Features of plate boundary:
- Volcanic Arc (land)
-Trench (ocean)

Examples:

- Andes Mountains

-Peru Trench