what are they made of, how are they made, how do they erupt, where does lava come from, etc.
210866
Ash  | Lava flow | Lava dome | Lava | Vent | Tephra | Caldera | Lahar | Fissure | Dike | Magma
260863
It says it right there, all you have to do is explain how it [whatever IT is] erodes away rocks and creates caves. Talk about how it breaks down the rocks, calcium carbonate, and hollows everything out. Also speak of the formation of stalagmites.
33980
I was taught in school that it is due to radioactive decay of elements in the core.  That is pure bullcrap.  If it were true, every time a volcano exploded, there would be radioactive toxins spread out across the world.  Others say gravity pushing on the substances create heat and liquification of earth.  This may be somewhat true.  If you put a piece of solid ice in a chamber and put extreme pressure on it, it turns to liquid.  There must be some other source of internal heat generation though.  I have never found a satisfactory answer to date.  I really don't think anyone knows, just like gravity is still a big mystery.
638796
Rock is made when lava cools. If that lava had gases dissolved in it, as it cools the gas escapes, like bubbles in a glass of coke.  As rock is really solid, as it cools it sets. Trapping the bubbles inside, the same way the bubbles from baking powder make bread rise.
26729
A island is formed when underwater volcanoes erupt and cool rapidly building the hot magma onto the molten rock.  Eventually the rock keeps building upon itself and a island is risen after many years.
267332
in building a volcano...\nmaterials:\nvinegar\nbaking soda\npebbles\nfood color(orange as lava)\nprocedure:\nArrange the pebbles or stones in a volcano shape.make sure that there is a hole at the center.Fill the hole by means of putting the vinegar mixture(vinegar+food color)then add baking soda..The volcano will erupt....
271275
Here you go:\n\nhttp://volcano.und.edu/vwdocs/msh/
674480
I have got some sites for science projects on volcanoes.\n\nhttp://www.all-science-fair-projects.com/project815_39.html\n\nThis is another project for making a volcano with a purchased kit.\n\nhttp://www.hobbytron.com/make-volcano-model-science-project-experiment.html\n\nThis is another volcano science project.\n\nhttp://www.scienceproject.com/projects/intro/primary/PX001.asp
11840
Okay...well you have to check out this interactive link on the discovery channel's website.\nhttp://kids.discovery.com/games/pompeii/pompeii.html\nIt's pretty cool and informative.  It should tell you what you need to know.\n\nHere are some other resources:\nhttp://www.brookes.ac.uk/geology/8361/1997/ellie.html\nhttp://www.vesuvioinrete.it/e_index.htm\nhttp://volcano.und.edu/vwdocs/volc_images/img_vesuvius.html
77419
Currently there are over five thousand active volcanoes underwater varying from ones larger than any on the surface to cones no larger than an automobile. The net reslut of this action is thermal heating of the oceans, at key positions, which in turn reaches the surfaceto be carried aloft into the atmosphere to become part of our surface weather pattern system. As the oceans are heated winds of a high velocity are created and driven over the land areas due to temperature differential. \n\nIn the Pacific Ocean there are ocean basins - volcanoes, of which there are estimated to be about 20,000 on the ocean bottoms of the world. Some of these form single mountains, and others join with other volcanoes to form ridges. The highest ones rise above the surface of the water as islands, which in many cases linear groups such as the Hawaiian Islands. \n\nIsland groups are simply the highest summits of ridges. The submerged part of the Hawaiian Islands is among the largest and longest of these volcanic ridges--more than 1,500 miles (2,400 kilometers) long. \n\nMany island groups of the Pacific are linear in form, with the largest and highest island of the group at one end and the lowest and smallest at the other. This feature is true of the Hawaiian Islands, explained as the result of intermittent movement of the tectonic plate over what is called a hot spot. \n\nMolten volcanic material is ejected from it and results in the formation of a large mass of material if the plate pauses for a sufficient length of time at the spot. In this way a volcanic island, or ridge, is built. The plate moves, and another part of it lies over the hot spot, receiving fresh volcanic material. Meanwhile the older material, if it has become an island, is subject to erosion and thus is worn down.
442464
My guess is dissipation, hydrothermal, volcanic. Just guessing.
515855
Some are man-made. But the ones where the nodes imploded and have microwaves are not. Who/what made them? No one knows...
370915
Hawaii's story is that of creation - islands born from the Pacific depths some 40 million years ago. Hawaii continues to be shaped by the capricious forces of fire, magma, rains, and winds. About 30 miles southwest of the active volcano Kilauea on the Big Island of Hawaii, the newest island in the chain, Loihi, is forming - the newest land on earth.
28218
It depends on the volcano.\n\nIf magma - molten rock - is erupted it forms new formations when it cools. On the big island of Hawaii, the volcanic eruptions have added a lot of new land to the island.\n\nIf it is a pyroclastic flow - fast, hot gasses and volcanic debris -  like the one that destroyed Pompeii or Mt. St. Helens, there may not be any new land created and the existing land will be radically altered.\n\nIn general, when a land based volcano erupts, the lava and stone and ash build up around the eruption site into a cone shape.\n\nUndersea volcanos spweing lava also build up, but not in a cone shape. Once the hot rock hits water it starts to cool into large pillow-shaped forms.
355609
Check the link below.  It can be formed through volcanic activity as well as crystallizing out of mineral rich water deposits.  It is almost pure iron that is oxidized.
380884
1.the molten mixture of rock-forming subtances, gases,and water deep in earths mantleis called magma .\n2.the ring of fire is a belt of volcanoes around the rim of the pacific ocean.\n3.the more Silica that the magma contains, the thicker the magma is.\n4.An eruption happens when an explosive erruption hurls ash,cinder,bombs,and gases out of a volcano. \n5.in a process called smeltin, an ore is melted to separate the use full metal from other elements from the ore.\n6.the property of density is the mass of the minral sample per unit volume.
15449
Heres a few places to start with;\nhttp://www.volcanolive.com/mehetia.html\nhttp://www.swvrc.org/cerupt.htm\nhttp://volcano.und.nodak.edu/vwdocs/volc_images/Mehetia.html