underwater caves are formed when over a period of time, tides smashes the rocks and erodes it. gradually, it forms an underwater cave.
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It's true that sea-caves, as the answer states, are formed by erosion by wave-action, and they can hold deep water, but I suspect the questioner is asking about true underwater caves. If so:
Undersea cavessuch as the Blue Holes are normal terrestrial karst caves formed in low-lying limestone at a time of depressed sea-levels (the glaciations), then drowned as sea-level rose when the ice-cover retreated.
Water-filledcaves on land areagain simply normal limestone caves, but the passages have formed vertically-sinuous profiles that trap water in "sumps",rather like the U-bend under the kitchen sink.
Underwater caves are natural formations in the ocean or a body of water that have been eroded or carved out by the movements of water over time. These caves can vary in size and shape and often contain unique ecosystems and marine life. Some underwater caves are popular destinations for divers due to their beauty and diversity of marine species.
Not sure quite what you are asking about, but anyway it is more accurate to ask what kinds of rock hold the caves, not what rocks are in the caves. Most caves are in limestone, a sedimentary rock, irrespective of water-level. There are a few caves in igneous rock: lava-tubes in basalt-flows, but on land, not underwater. There are also a good many caves in marble, the metamorphic but still-soluble form of limestone; and again the water-level is secondary to the cave itself. A few caves exist in rock-salt, an evaporite.
The Bioluminescent Mushroom lives underwater.
The Maquoketa Caves in Iowa were formed millions of years ago by the dissolution of the local bedrock, primarily dolomite, by groundwater. Over time, this erosion process created the unique cave systems and features that are now part of the Maquoketa Caves State Park.
Caves are formed by rainwater dissolving away limestone or sandstone.
Underwater caves are natural formations in the ocean or a body of water that have been eroded or carved out by the movements of water over time. These caves can vary in size and shape and often contain unique ecosystems and marine life. Some underwater caves are popular destinations for divers due to their beauty and diversity of marine species.
Underwater Spelunking
Not sure quite what you are asking about, but anyway it is more accurate to ask what kinds of rock hold the caves, not what rocks are in the caves. Most caves are in limestone, a sedimentary rock, irrespective of water-level. There are a few caves in igneous rock: lava-tubes in basalt-flows, but on land, not underwater. There are also a good many caves in marble, the metamorphic but still-soluble form of limestone; and again the water-level is secondary to the cave itself. A few caves exist in rock-salt, an evaporite.
No. Most caves are formed out of limestone making that false.
No life.
Wookies live in trees, not caves.
The Maquoketa caves in Iowa were formed through years of natural non-glacial erosion.
No, sorry there isn't.
no they live in rivers
You can't.
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In the underwater sealed cave and in the three regi caves