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|the theory that solid plates move on top of a slowly flowing mantle.
|the edges where different plates on Earth are touching.
|to come together
|a boundary at which two plates collide, causing mountain building or subduction.
|a mountain range formed when the Indian plate collided with the Eurasian plate.
|the process of one plate sliding under another. The denser plate is driven down into the mantle.
|RING OF FIRE
|an area circling the edges of the Pacific Plate where large numbers of earthquakes and volcanic eruptions occur.
|a range of continental volcanic mountains formed along a subduction zone. The Cascade Mountains along the Northwest coast of the United States and the Andes Mountains along the Western coast of South America are examples.
|an island chain formed as one oceanic plate subducts under another and produces magma at depth below the over-riding plate. Japan, the Philippines, the Mariana Islands, and the Aleutian islands are all examples.
|deep valleys formed underwater in subduction zones. A trench marks the position at which a flexed subducting plate begins to dive beneath another plate.
|deepest known part of the world's oceans. Located in the western Pacific Ocean, to the east of the Mariana Islands.
|a boundary at which two plates are separating. As the plates move in opposite directions, magma bubbles up, forming new crust.
|an underwater mountain range that is almost 50,000 miles long.
|part of the Mid-Ocean Ridge located along the floor of the Atlantic Ocean.
|deep valley which runs down the middle of the Mid-Ocean Ridge.
|SEA FLOOR SPREADING
|the idea that new seafloor crust forms at mid-ocean ridges and then spreads in opposite directions. The youngest rocks of the ocean floor are at the diverging boundary, moving outward.
|a boundary in which two plates scrape and slide past each other. The San Andreas Fault is one such boundary.