what are 3 ways sedimentary rocks form?
94012
The key word here is 'form'. Sedimentary rocks can be broken down into three informal groups. The first group is known as siliciclastic, or just as clastics and these include rocks like sandstone, shale, and conglomerates. These rocks are transported and deposited by water, wind, or gravity. Eventually when they are buried under enough pressure they will become lithified by diagenesis. That is a process that 'cements' them together. They are also described as allocthonous, meaning they originated in a different place from where they were deposited. \n\nThe second informal group of sedimentary rocks are carbonates. Carbonates include limestone and dolomite. These rocks are mostly built by living organisms. Shells from marine organisms, corals, and many algaes all form carbonate rocks. Some but not all carbonates are autochthonous, meaning they originated in the place they were found. Carbonate rocks often form as rock quite quickly and undergo various stages of later diagenesis. The key thing to remember about carbonate rocks is they were "born" and not just transported like clastics. Most carbonates are formed in the ocean. \n\nThe third informal group of sedimentary rocks are called chemical sedimentary rocks. These form by evaporation or precipitation from water, so at some point they were completely dissolved. Examples of this type of rock are gypsum, halite (sodium chloride salt), and sylvite (potassium chloride salt). These rocks can form under certain ocean conditions or in places like dry lakes where the evaporation leaves them behind.\n\nSo the short answer:\n1. by transport\n2. in place by living organisms\n3. by chemical deposition
552288
rocks are made up of minerals
204671
Limestone Formation 101:\n\n1.) Ocean organisms that contain calcium carbonate in their shells (shellfish or forams)die & settle to the bottom of the ocean floor.\n2.) At certain depths within the ocean, calcium carbonate begins to dissolve.\n3.)Deposits build up over time (millions of years)\n4.)Oceans transgress & regress (move inland & back out again) placing layer upon layer down over time.\n5.)All the layering & pressure from the ocean above causes the dissolved CaCO3 to harden into rock.\n6.)Sometimes pieces of shells are included in the rock (fossiliferous limestone - containing fossils)\n7.)Poof...There you have the recipe for limestone.
222018
rock formed from layered sediments that pile up and squeeze together, providing clues to the earth's past. an example is sandstone.
780790
1. Shale\n2. Sandstone\n3. Siltstone \n4. Conglomerate\n5. Breccia\n6. Arkose\n7. Chert \n8. Claystone\n9. quartz sandstone\n10. Halite
680937
1 Deposition\n2 Compaction\n3 Cementation
877428
1. Sedimentation.\n2. Compaction.\n3. Dewatering/degassing\n4. Lithification by heat and pressure.
161879
Sedimentary:\nAndesite is an igneous rock with feldspar, quartz, pyroxene, biotite and hornblende minerals in it. The feldspar, pyroxene, biotite and hornblende will weather out to become clay. In some situations they may become grains or clasts. The quartz will become grains. So they will become shale and sandstone (possibly conglomerate), depending on the amount of weathering. \n\nMetamorphic:\nAssuming you mean direct metamorphism of andesite, the andesite will become greenstone, greenschist, amphibolite, or granulite depending on the degree of metamorphism.\n\nIf you are having trouble figuring out the different metamorphic series go here and click on the links marked by "rock cycle stage" to see diagrams:\nhttp://csmres.jmu.edu/geollab/Fichter/Wilson/Rkcyckey.html
82209
Basically one of three ways. These are extrusion, intrusion, and accretion. \n\nExtrusion is the process of volcanism. Volcanoes erupt molten rock that may have originated as subducted oceanic crust or deeper rock. This magma adds huge volumes of rock to the crust as it erupts and cools into solid rock. \n\nIntrusion is a similar process, but no eruption takes place. Large bodies of molten rock float upward over long time periods through the crust. When these cool and harden they are called plutons or batholiths (depending on size-batholiths are larger). These form large parts of the crust.\n\nAccretion is the other method. In some instances plate tectonics can force oceanic plates up and over continental plates. These often form what are called ophiolites where we can examine oceanic crust on dry land. Large parts of continents or islands are often forced against continental plates. This can force sediments and oceanic crust upward creating what are called 'accretionary terrane'. Much of California is an accretionary terrane, built of islands in a fore arc subduction zone that were forced up against a paleocoastline that once was near the eastern border of present day California. \n\nHere two other explanations similar to my own that illustrate these processes:\nhttp://www.physicalgeography.net/fundamentals/10j.html\nhttp://earth.leeds.ac.uk/assyntgeology/extra_info/ehistory.htm
786248
dairydahm is right!  It's conglomerate.  Sedimentary (so you were right, too) rocks can contain pebbles of similar or varying sizes, depending where it formed.  Below are some sites that have pics of conglomerates for you to check--if you don't believe us.  (I'm a geology teacher, by the way.  (-; )
1171684
Erosion breaks up igneous and metamorphic rocks, and the particles build up to create sedimentary rocks.  \n\nHope this is helpful.
786689
Sedimentary rocks are formed at the surface of the Earth, either in water or on land. They are layered accumulations of sediments: fragments of rocks, minerals, or animal or plant material. Temperatures and pressures are low at the Earth's surface, and sedimentary rocks show this fact by their appearance and the minerals they contain. Most sedimentary rocks become cemented together by minerals and chemicals or are held together by electrical attraction; some, however, remain loose and unconsolidated. The layers are normally parallel or nearly parallel to the Earth's surface; if they are at high angles to the surface or are twisted or broken, some kind of Earth movement has occurred since the rock was formed. Sedimentary rocks are forming around us all the time. Sand and gravel on beaches or in river bars look like the sandstone and conglomerate they will become. Compacted and dried mud flats harden into shale. Scuba divers who have seen mud and shells settling on the floors of lagoons find it easy to understand how sedimentary rocks form. \n\nExamples:\n\nArkose \nBreccia \nChalk \nChert \nClaystone \nCoal \nConglomerate \nCoquina \nDolomite \nEvaporite \nGreywacke \nLimestone \nMarl \nMudstone \nOolite \nSandstone \nShale \nSiltstone \n\nFor more check :\n\nhttp://interactive2.usgs.gov/learningweb/explorer/topic_rocks_sedimentary.htm\n\nhttp://en.wikipedia.org/wiki/Sedimentary_rocks\n\nhttp://en.wikipedia.org/wiki/List_of_rocks
297265
I'm going to assume you are asking about deposition of rock, but am unsure because this is under 'other' and not earth science. \n\nDeposition of rock in the marine environment occurs in at least three ways. The first is by transport, which can be by wind, water, gravity, or ice. Water from rivers carries sediment into ocean basins where it deposits forming deltas, and turbidite deposits on the deeper ocean floor. Wind carries sediment out over the oceans. Gravity causes landslides that often continue into the marine environment, and sometimes take place entirely within the marine environment. Icebergs often carry rock out over the ocean floor and as they melt the rock drops to the sea floor. These ice-transported rocks are known as erratics. \n\nMuch of the deposition of rock material, or what eventually becomes rock, in the marine environment comes from biological sources. Plankton die and sink to the ocean floor, coral reefs build huge platforms (Florida for example) that become limestone rock. Many marine organisms use calcium carbonate to form shells and other parts of their structure, marine algae often contain calcium carbonate, and many microscopic marine organisms precipitate calcium carbonate and some other minerals as part of their biological processes. \n\nChemical deposition also occurs in the marine environment, and deposits of calcium carbonate (very few, but some), salt (halite, sylvite, etc.), and calcium sulfate in the form of gypsum or anhydrite occur as a result of oversaturation conditions in ocean water. Often this deposition only occurs when special conditions exist that confine a portion of an ocean basin and allow the concentrations of dissolved minerals to build up. An example would be the Mediterranean Sea during the Messinian Salinity Crisis in the late Miocene.
93900
Geodes form by precipitation of minerals from solution. That would make it a chemical sedimentary rock. \n\nThey are not often found in intrusive igneous rocks because the geode needs a vug, or a cavity within the host rock in order to form. Intrusive igneous rocks rarely have vugs, but do sometimes have large fractures or joints that can be crystal lined similar to a geode. \n\nGeodes are more likely to be found in extrusive igneous rocks that have vugs formed by gas that comes out of solution as the rock cools rapidly (in comparison to intrusive igneous rocks). These vugs eventually may fill with fluid which carries dissolved calcite, quartz, and other minerals. As the fluid becomes oversaturated different minerals will drop out of solution forming layers of the geode and finally forming crystals within the center of the geode. \n\nThe similar things that form in sedimentary rocks are often referred to as concretions, and these are seldom hollow. They may be composed of calcite, chert, or other minerals, and will often have concentric rings within them. However, they do not form within a vug or cavity, but instead appear to grow outward. Septarian concretions have crystalline filled fractures inside them that makes them quite attractive. Concretions appear in most cases to form from a nucleus and grow outward, unlike a geode's growth inward.
787241
Bowen's reaction series is what you're looking for.\n\nIn a nutshell, the rate of cooling, temperature, and magma composition determine which minerals form and the ultimate rock type.  The links provide more information.
962499
There are many different sedimentary rocks but only three basic causes.\n\nFirst is where rock is weathered out and is washed down into valleys and rivers where it forms a mud and is then pressured to turn into rock.\n\nThe other is the sea floor where the same silt settles and becomes a thick layer over the years.  Then either the sea recedes or the land is thrust up leaving the mud high and dry as sedimentary rock.\n\nLastly we have limestone and chalk where sea creatures die, sink to the ocean floor and accumulate.  This then follows the same upthrust or ebb of the sea and is exposed as rock on the mainland.
75245
rock\npunk rock\nalternative rock