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Igneous rocks form when molten lava (magma) cools and turn to solid rock. The magma comes from the Earth’s core which is molten rock . The core makes up about 30% of the Total Earth Mass (31.5%)
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www.rocksforkids.com/RFK/howrocks.html
www.rocksforkids.com/RFK/howrocks.html
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Metamorphic 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.
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www.fi.edu/fellows/fellow1/rocks/create/metamorph.htm
www.fi.edu/fellows/fellow1/rocks/create/metamorph.htm
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Igneous rocks form from molten rock which is either ejected at the surface of the earth or cools off underground. When volcanoes erupt, they can eject molten rock as shown in the following picture.
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www.usoe.k12.ut.us/curr/science/sciber00/8th/earth/scib...
www.usoe.k12.ut.us/curr/science/sciber00/8th/earth/sciber/rocks2.htm
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form by recrystallization of either igneous or sedimentary rocks. This happens when the temperature, pressure or fluid environment change and a rock changes its form (e.g. limestone turns to marble).
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topex.ucsd.edu/es10/lectures/lecture10/lecture10.html
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Igneous rock is made by fire. Small wonder the magma from which igneous rock is formed can reach temperatures close to 1200 degrees Celsius. As the super hot magma cools, it solidifies to form a rock and that rock is called igneous rock.
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www.edu.pe.ca/southernkings/igneousjj.htm
www.edu.pe.ca/southernkings/igneousjj.htm
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Petrologic, petrographic, and petrogenetic studies can be applied to igneous, metamorphic or sedimentary rocks. ... Petrology and petrography became important in geology in the mid 19th century with the development of the microscope and the thin section to aid in the description of various rock types.
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www.brocku.ca/earthsciences/people/gfinn/petrology/petx...
www.brocku.ca/earthsciences/people/gfinn/petrology/petx3.htm
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Earth Sciences Question: How Does An Intrusive Igneous Rock Form? One way is from the cooling of lava on earths surface. ... Why Does Intrusive Igneous Rock Form From Lava Cooling On Earths Surface?
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www.blurtit.com/q177324.html
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A good example of intrusive igneous rock is granite. Extrusive igneous rocks form when the magma pours out onto Earth's surface or erupts at Earth's surface from a volcano.
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www.scienceclarified.com/Ro-Sp/Rocks.html
www.scienceclarified.com/Ro-Sp/Rocks.html
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www.brynmawr.edu/geology/102/lectures/PlanetEarth/sld00...
www.brynmawr.edu/geology/102/lectures/PlanetEarth/sld005.htm
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