what are the 4 types of igneous rocks?
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granite....sand...\nhttp://images.google.com/imgres?imgurl=http://library.thinkquest.org/05aug/00461/images/igneous.jpg&imgrefurl=http://library.thinkquest.org/05aug/00461/igneous.htm&h=423&w=640&sz=262&hl=en&start=17&tbnid=1_Wjmt6u5ghPyM:&tbnh=91&tbnw=137&prev=/images%3Fq%3Digneous%2Brocks%26svnum%3D10%26hl%3Den%26lr%3D\n\n\nthe most common....basalt...\nhttp://images.google.com/imgres?imgurl=http://www.learner.org/channel/courses/essential/earthspace/images/show5-brit-with-igneous.jpg&imgrefurl=http://www.learner.org/channel/courses/essential/earthspace/session3/closer.html&h=300&w=300&sz=28&hl=en&start=14&tbnid=iEnzTA6MoGvW4M:&tbnh=116&tbnw=116&prev=/images%3Fq%3Digneous%2Brocks%26svnum%3D10%26hl%3Den%26lr%3D\n\n\npumice...\nhttp://images.google.com/imgres?imgurl=http://www.otago.ac.nz/geology/features/rocks-minerals/pumice.jpg&imgrefurl=http://www.otago.ac.nz/geology/features/rocks-minerals/rocks.html&h=667&w=800&sz=47&hl=en&start=6&tbnid=QxNtL7z7RM7VCM:&tbnh=119&tbnw=143&prev=/images%3Fq%3Dpumice%26svnum%3D10%26hl%3Den%26lr%3D\n\nobsidian...\nhttp://images.google.com/imgres?imgurl=http://faculty.icc.edu/easc111lab/labs/labb/rocks/ibox.jpg&imgrefurl=http://faculty.icc.edu/easc111lab/labs/labb/igneous.html&h=330&w=265&sz=59&hl=en&start=47&tbnid=6qFg9tv5UzEBnM:&tbnh=119&tbnw=96&prev=/images%3Fq%3Digneous%2Brocks%26start%3D40%26ndsp%3D20%26svnum%3D10%26hl%3Den%26lr%3D%26sa%3DN
1038213
Mostly Anorthosite, an igneous rock consisting primarily of plagioclase feldspar. One the surface, anyway.
90162
There are many more than 4 types of clouds, but in elementary classes they teach that the 4 types are:\n\n1. cumulus\n2. stratus\n3. cirrus\n4. nimbus\n\n\nIf you want to see a much longer list, I have included a reference. \n\nThis reference lists the following 4 types of clouds:\n\nA. High clouds\nB. Middle clouds\nC. Low clouds\nD. Vertical clouds\n\nI am not sure that this is a particularly useful classification system. \n\nI find it interesting that there is still a lot we do not know about clouds. Clouds can both heat and cool the surface. Not all clouds are even composed of condensed water vapor. Current theories of the ozone depletion mechanism rely on the existence of stratospheric polar clouds that are probably not composed ice crystals, but  nitric acid and water, probably in the form of crystals of nitric acid trihydrate ("NAT"), HNO3.3(H2O) (see second reference).
621837
neither granite nor obisdian are minerals they are two different types of igneous rocks. basically molten granite cools slow generating large crystals, obsidian cools very fast giving it a glassy look and making it nearly impossible to pick out individual crystals
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The Rock Cycle is a group of changes. Igneous rock can change into sedimentary rock or into metamorphic rock. Sedimentary rock can change into metamorphic rock or into igneous rock. Metamorphic rock can change into igneous or sedimentary rock. \nIgneous rock forms when magma cools and makes crystals. Magma is a hot liquid made of melted minerals. The minerals can form crystals when they cool. Igneous rock can form underground, where the magma cools slowly. Or, igneous rock can form above ground, where the magma cools quickly. \n\n \n\nWhen it pours out on Earth's surface, magma is called lava. Yes, the same liquid rock matter that you see coming out of volcanoes. \n\nOn Earth's surface, wind and water can break rock into pieces. They can also carry rock pieces to another place. Usually, the rock pieces, called sediments, drop from the wind or water to make a layer. The layer can be buried under other layers of sediments. After a long time the sediments can be cemented together to make sedimentary rock. In this way, igneous rock can become sedimentary rock. \n\nAll rock can be heated. But where does the heat come from? Inside Earth there is heat from pressure (push your hands together very hard and feel the heat). There is heat from friction (rub your hands together and feel the heat). There is also heat from radioactive decay (the process that gives us nuclear power plants that make electricity). \n\nSo, what does the heat do to the rock? It bakes the rock.\n\nBaked rock does not melt, but it does change. It forms crystals. If it has crystals already, it forms larger crystals. Because this rock changes, it is called metamorphic. Remember that a caterpillar changes to become a butterfly. That change is called metamorphosis. Metamorphosis can occur in rock when they are heated to 300 to 700 degrees Celsius. \n\nWhen Earth's tectonic plates move around, they produce heat. When they collide, they build mountains and metamorphose (met-ah-MORE-foes) the rock. \n\nThe rock cycle continues. Mountains made of metamorphic rocks can be broken up and washed away by streams. New sediments from these mountains can make new sedimentary rock. \n\nThe rock cycle never stop
967908
In a phrase, volcanic rock.\n\nEach volcano erupts constructively and destructively, and some of those constructive eruptions build the sides of the volcano.  The type of magma determines the color and shape.
869704
Igneous, metamorphic, and sedimentary rocks all have the potential to become one of each of the other types of rock through the rock cycle. Igneous and metamorphic rocks can be broken down into rock fragments and cemented to form a sedimentary rock. Sedimentary or igneous rocks can undergo changes in temperature and pressure to form metamorphic rocks. And all three types can be melted and reformed as igneous rocks.
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There are three basic types of rocks: igneous, sedimentary, and metamorphic.\n\nIgneous rocks are formed from molten magma or lava. Igneous rocks vary greatly in grain structure and size, depending upon how quickly the magma or lava cooled. An example of an igneous rock is obsidian.\n\nSedimentary rocks are formed when layers of sediment are compacted by pressure. They are often composed of fragments of materials derived from other rocks and minerals, especially quartz.\n\nMetamorphic rocks occur when igneous, sedimentary, or previously-formed metamorphic rocks are submitted to extreme heat or pressure beneath the earth's surface, changing their structure and appearance. They often exhibit "foliation" or color banding when mineral crystals are elongated due to pressure. An example of a metamorphic rock is slate.
230570
Mafic lava is very hot and flows easily it contains less silica and are enriched in iron (Fe), magnesium (Mg), and calcium (Ca) and just encase your trying to get a homework answer I will leave it at that if not you will know what I mean ;)
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Granite, forms deep underground\nObsidian, the really dark and smooth black rock\nBasalt, which forms from volcanoes mostly\nPumice, the really light rock that floats on water\n\nand a few others, listed in the source site
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Basalts (specifically MORB <mid ocean ridge basalt> types)
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rock refers to solid mineral deposits. Rocks are minerals, but not all minerals are rocks.\nSome minerals, given time and circumstance, form solid deposits. These solid mineral deposits are known as rock. Pressure, temperature, erosion, and friction are forces that effect the formation of rocks. The rock formation process allows geologists to classify rocks into three groups: sedimentary, igneous, and metamorphic. Sedimentary rock forms when layers of "sediment" (small particles of solid minerals like sand and pebbles) fuse together over time under the force of water or wind. Sedimentary rock is commonly found in and near riverbeds and streambeds. Igneous ("fire-formed") rock forms after minerals are heated to extremely high temperatures and then allowed to cool.
1038449
I think what you mean is what components have an effect on the melting point in igneous rocks. According to Bowen's Reaction Series, rocks rich in aluminum and iron tend to melt at higher temperatures whereas rocks rich in silicon melt at lower temperatures. Water tends to lower the melting point of rocks.
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Basalt is an igneous rock, it is cooled lava. so you would find it in ancient cooled magma flows or old volcanos.
45660
Three types of rocks: igneous (formed by volcanic activity, like obsidian and pummice), metamorphic (formed by heat and pressure, like marble and quartzite) and sedementary (formed by accumulated depositing of loose material, packed hard into a rock, like sandstone and limestone).
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Too long to list:\nhttp://seis.natsci.csulb.edu/bperry/ROCKS.htm\ngood site
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OMGGG!! I can go on forever on this one... but I'll try to be as brief as possible. \n\nOk, so rocks are made by three different processes: \n\n- Volcanic eruptions - These rocks are called IGNEOUS ROCKS.  There are various types of rocks that can be produced.  They can be from either when lava flows on the surface of the earth and cools down, or when magma inside a volcano cools down before it hits the surface.  It doesn't take all that long for these types of rocks to form, and hese rocks are usually crystallized and can be easily distinguished because of the crystal type of formation.\n\n- Another tyoe of rocks - called SEDIMENTARY ROCKS are a result of erosion by wind, water, or glaciers.  These types of rocks may take thousands or even millions of years to form.  So, in this process, sediment (the tiny particles) that is eroded away from the different erosion processes settle in one place and over a long period of time they are formed into rocks. One layeer after the next. \n\n- And the last types of rocks are formed from either Igneous rocks or Sedimentary rocks.  These are called METAMORPHIC ROCKS... word derived because thise rocks have "morphed" into something that is no longer sedimentary or igneous rocks.  These rocks go through these changes and become Metamorphic due to the high pressure which causes heat to build up in these solids.  These rocks can also be relatively easily distinguished because when you look at them, you can actually see flat grains.\n\nso, no! Rocks do not magically appear but they appear over time.  \n\nThere is tons more to the subject, as in you can actually study a given rock and tell how old it actually is and when it was originally formed, but that's another question! :)\n\nhope this helped... \nCheers!