What is the melting poing of a rock?
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Lava is molten rock. It is red hot which shows it is about 600 centigrade.\nThe melting point must be lower. It depends strongly about the kind of rock (basalt, granite, gneis, ...).
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The melting point of glass depends on its composition.  Some glass will melt at temperatures as low as 500 °C (900 °F), others melt at 1650 °C (3180 °F).
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melting physical\nrusting chemical\nburning chemical
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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.
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First it's igneous rock-weathering/erosion-sediment-pressure and cementation-sedimentary rock-heat and pressure-Metamorphic rock-melting magma cool to be igneous rock
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Sea salt melts it quickly.\n\n\nPeace
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Rock salt decreases the freezing point of water which causes melting.
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When lava (melted rock) is extruded onto the surface of the Earth, it forms new igneous rock. Lava doesn't last long on the Earth's surface before it cools. \n\nIs your question actually concerning the oldest igneous rocks?
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it's the core of the earth. lava. melted rock.etc
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weathering of rocks due to wind,flowing water
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intrusive igneous rock meaning formed when molten magma is inside the earth and cools there as opposed to extrusive which flow to the surface and cools there
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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
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* Igneous Rocks\nIgneous rocks are called fire rocks and are formed either underground or above ground. Underground, they are formed when the melted rock, called magma, deep within the earth becomes trapped in small pockets. As these pockets of magma cool slowly underground, the magma becomes igneous rocks. \n\nIgneous rocks are also formed when volcanoes erupt, causing the magma to rise above the earth's surface. When magma appears above the earth, it is called lava. Igneous rocks are formed as the lava cools above ground.\n\n* Metamorphic Rocks\nMetamorphic rocks are rocks that have "morphed" into another kind of rock. These rocks were once igneous or sedimentary rocks. How do sedimentary and igneous rocks change? The rocks are under tons and tons of pressure, which fosters heat build up, and this causes them to change. If you exam metamorphic rock samples closely, you'll discover how flattened some of the grains in the rock are.\n\n* Sedimentary Rocks\nFor thousands, even millions of years, little pieces of our earth have been eroded--broken down and worn away\nby wind and water. These little bits of our earth are washed downstream where they settle to the bottom of the rivers, lakes, and oceans. Layer after layer of eroded earth is deposited on top of each. These layers are pressed down more and more through time, until the bottom layers slowly turn into rock.
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It will melt.  Look for it to start piling up toward the end of December and into January.
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When the earth formed, it was basically all just really hot rock.  So hot, in fact, that it melted.  When the rock melted, the heavier elements (iron and nickel) sunk towards the core of the earth.  This sinking of heavy elements transferred a lot of gravitational potential energy into heat energy.  The same can be seen today.  If you drop something heavy into a bucket of water, after you drop it enough, the water itself warms up.  This heat energy from the formation of the planet was the primary source of the heat of our planet.  However, another major source of heat today is the breakdown of radioactive elements inside the earth.  Both of these contribute to the heat the Earth generates.
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Solid\nCopper melts at 1083ºC
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What do you mean by "delt with friction", do you mean eruption as a result of friction?\n\nNo, eruption is not the result of friction.\nIt is pressure of lava that finds openings in the joints of different plates of the earth crust.\n\nYou might be thinking that plate movements may be creating friction and thus the lava is coming out! No, this is not the case for eruption.