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It represents the line of divergence (divergent plate margin) between oceanic plates, where two oceanic plates are moving apart and new oceanic crust is formed.

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Q: What does the rift valley along a mid ocean ridge mark?
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Is a mid-ocean ridge convergent?

No. Mid-ocean ridges mark divergent boundaries.


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Mark Valley was born on December 24, 1964.


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On the reverse side of the coin look at the word "HALF". Just to the left of that word is a narrow "valley" that runs along the edge of the coin. The mint mark is in that "valley". If there is no letter in the valley, the coin was minted in Philadelphia.


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What happens to the old crust as new crust forms?

Mid-ocean ridges mark these sites where the ocean floor is spreading apart. As the ridges continue to widen, a gap called a forms. Here molten material rises to build new crust. When molten material rises from the asthenosphere, cold ocean water cools the rock until it becomes solid. As the plates move apart, new cracks open in the solid rock. More molten material rises and hardens. The growing ridge stands high above the sea floor. The world's longest ridge, the Mid-Atlantic Ridge, runs the length of the Atlantic Ocean. Here the North and South American plates are moving away from the Eurasian and African plates. The ridge extends nearly 11,000 kilometers (6214 mi) from Iceland to near Antarctica. The rift valley is 24 kilometers (15 mi) wide and 9 kilometers (6 mi) deep-about 7 kilometers (4 mi) deeper than the Grand Canyon!


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Mark Valley is the name of an American actor who is best known for his role on the television program "Boston Legal." Additional information about Valley can be found on Wikipedia or IMDb.


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