In Hawaiian Islands, why do coral reefs die after the islands are eroded?
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I'll tell you if you promise not to remove the question and cheat me out of the hard-earned points. I thought I gave you a good answer to your question on P and S waves, so I was disappointed to see the question removed. \n\nCoral lives in a very small zone of water depth. Most true coral can only survive where there is lots of sunlight and oxygen in the water. It needs this because it depends on catching small plankton with their tentacles. Most plankton and zooplankton live in the shallow zone where there is lots of light.\n\nIf the water depth changes, as it can when some volcanic islands slowly sink, or if there is a lot of sediment in the water from ersoion, the coral can't move and will simply starve. There is other evidence that coral is being killed by higher levels of UV light penetrating the atmosphere. \n\nHere's link with some basic information:\nhttp://saltaquarium.about.com/cs/coralcare/a/aa022103.htm
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Well there are several possible explanations:\n\n1. It does not exist, but is just the result of confirmation bias. We only remember stories which confirm our preconceived notions, and forget the others. \n\n2. There are many dangerous waters there with reefs and rocks and islands, and many ships are destroyed this way. \n\n3. The topography of the area lends itself to occasional freakishly large waves which destroy ships. \n\n4. Methyl gas hydrates occasionally are released from the sea bed, causing ships to sink and planes to crash. \n\n5. It is a region with violent sudden storms like hurricanes.
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The dirt that covers Hawaii is much older than Hawaii it blew in from China. The same forces covered your artifacts.
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if you drain the ocean you will see mountains, hills, if you fill it back agains you only see their tip, islands.. made erosions, volcanic eruptions, and so on..
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The link below has a picture of the destruction of a rainforest habitat.  This is a typical destruction of a habitat.  Natives cut down the trees for money.  Without trees the rain erodes the land away, and the natives finally burn the remaining plant life so they can get to more trees.
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Erosion (note spelling) is the displacement of solids (soil, mud, rock and other particles) by the agents of wind, water or ice, by downward or down-slope movement in response to gravity or by living organisms (in the case of bioerosion). Erosion is distinguished from weathering, which is the decomposition of rock and particles through processes where no movement is involved, although the two processes may be concurrent.\n\nErosion is an intrinsic natural process but in many places it is increased by human land use. Poor land use practices include deforestation, overgrazing, unmanaged construction activity and road or trail building. However, improved land use practices can limit erosion, using techniques like terrace-building and tree planting.\n\nA certain amount of erosion is natural and, in fact, healthy for the ecosystem. For example, gravels continually move downstream in watercourses. Excessive erosion, however, can cause problems, such as receiving water sedimentation, ecosystem damage (including dead fish) and outright loss of soil.
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Coral reefs --\n\n\nCoral reefs (also known as sea gardens) are structures consisting of coral skeletons built upon coral skeletons. They grow in tropical seas in the photic zone, where there is mild wave action, not so strong it tears the reef apart yet strong enough to stir the water and deliver sufficient food and oxygen. Coral reefs also need nutrient-poor, clear, warm, shallow water to grow. The coral skeletons while alive house coral polyps.\n\n\n\nCoral reefs can take a variety of forms, defined as the following;\n\nApron reef — short reef resembling a fringing reef, but more sloped; extending out and downward from a point or peninsular shore. \nFringing reef — reef that is directly attached to shore or borders it with an intervening shallow channel or lagoon. \nBarrier reef — reef separated from a mainland or island shore by a deep lagoon; see Great Barrier Reef. \nPatch reef — an isolated, often circular reef, usually within a lagoon or embayment. \nRibbon reef — long, narrow, somewhat winding reef, usually associated with an atoll lagoon. \nTable reef — isolated reef, approaching an atoll type, but without a lagoon. \nAtoll reef — a more or less circular or continuous barrier reef surrounding a lagoon without a central island.
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The change in the water temperature (much warmer than usually) has not only an influence to the life in the sea (coral reefs dying) but also causes an increase in climate changes (extreme dry periods, tropical storms/typhoons).
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starfish. a study in the great barrier reef proved that increase in the no of starfish has been causing the disintegration of the reef.
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A couple of years ago, an IMAX film about the destruction of coral reefs was released.  I saw it but I can't vividly remember the details.  I just looked up the site for you.  It's http://www.coralfilm.com/.  There are links that will provide you with the information you're looking for.  Here's a sublink http://www.coralfilm.com/about.html#issues that tells you about the environmental threats and the impact of human activity.
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Stream beds change due to sediment load that it carries & amount of water. They can meander or cut deeper into their bed. Oxbow lakes can form when meanders are cut off from the rest of the stream.\n\nRocks weather by wind & water. Self explanatory. Rock is removed by the wind & water and redeposited somewhere else as sediment.\n\nShorelines can either build up or erode depending on where they are located. Hurricanes can wash away shorelines or build them up too. Depending on how intense the storm is & amount of storm surge/ high tide or low tide, etc. Barrier islands are constantly changing. They move further inland during transgressions & move back out again during regressions. Hurricane can also close or open new inlets along barrier islands. Many of NC's barrier inlets have been closed & reopened by major hurricanes over the past couple hundred years.\n\nKarst topography. Areas w/ limestone bedrock will form sinkholes where the limestone is dissolved by naturally forming acids. This occurs especially where too much water is pumped out from these limestone aquifers. You can get sinkholes & sinkhole lakes/ponds. Lots of these in Florida.
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Erosion breaks up igneous and metamorphic rocks, and the particles build up to create sedimentary rocks.  \n\nHope this is helpful.
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I think you mean rock fragments. If yes,\n\nRock fragments are further eroded by forces of nature: wind or water. depending on the level of disintegration, it forms various kinds of soil or sand.\n\nSometimes if fragments get buried under several layers of soil, fragments clump together to form sedimentary rocks\n\nHope that helps\n\nR
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Islands are pretty much the peaks of underwater mountains.  They stay above water because they've got more land underwater sitting on the ocean floor.
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They wash away the land,undermine cliffs,flood low lying areas and kill vegetation along the shoreline with salt,causing land degradation.
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When I was Hawaii recently I went to visit my favorite beach, Kahana Bay, and was very disappointed that the area was allowed to accumulate lots of garbage and floating debris was washed up all over the shore.  I would love to see this cleaned up and returned to the beautiful way I remember it.
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Most coral (if not all) used to be volcanic. While the volcano erodes down to just below sea level, the coral builds up to just above sea level. The result is called an atoll. \n\nWhile there are many underwater volcanoes--probably more than there are above the ocean's surface--they are not islands unless they are above water. Therefore, as a general rule, volcanic islands are much larger than coral islands.\n\nThere's an animated illustration of the formation of atolls in the article linked below.