Geology and topography also vary, with larger mountainous islands of continental rock, volcanic islands, and low-lying coral and limestone islands.
2.
When these icebergs melted they dropped the boulders and other continental rocks they carried, leaving layers known as ice rafted debris.
3.
The oldest rocks on the ocean floor are 200 mya-very young when compared with the oldest continental rocks, which date from 3.8 billion years ago.
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The Indian underground tests are conducted in a region with " very stable continental rocks, which should be very efficient at transmitting ( seismic ) signals ."
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Also in certain sections of the region, we can find granite, which is an mantle rocks, indicating that it came from the mantle and did not mix with continental rocks.
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There is also a rare amphibole called holmquistite, chemical formula Li 2 Mg 3 Al 2 Si 8 O 22 ( OH ) 2, which occurs only in lithium-rich continental rocks.
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North American continental rocks extend to Greenland ( a portion of the Canadian Shield ), and in terms of plate boundaries, the North American plate includes the easternmost portion of the Asian land mass.
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Where the edges of two colliding plates stack up, continental rocks can get dunked so deep into Earth that they melt again, liberating a great balloon of magma that rises back through the crust.
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Thus, the new mobilistic concepts neatly explained why the Earth does not get bigger with sea floor spreading, why there is so little sediment accumulation on the ocean floor, and why oceanic rocks are much younger than continental rocks.
10.
The Black Sea is connected to the Mediterranean through the Bosporus, but the Bosporus is a natural canal cut through continental rock some 7, 000 years ago, rather than a piece of oceanic sea floor like the Strait of Gibraltar.
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