- published: 15 Jan 2013
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Igneous rock (derived from the Latin word igneus meaning of fire, from ignis meaning fire) is one of the three main rock types, the others being sedimentary and metamorphic rock. Igneous rock is formed through the cooling and solidification of magma or lava. Igneous rock may form with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks. This magma can be derived from partial melts of pre-existing rocks in either a planet's mantle or crust. Typically, the melting is caused by one or more of three processes: an increase in temperature, a decrease in pressure, or a change in composition. Over 700 types of igneous rocks have been described, most of them having formed beneath the surface of Earth's crust. These have diverse properties, depending on their composition and how they were formed.
Igneous and metamorphic rocks make up 90-95% of the top 16 km of the Earth's crust by volume.
Igneous rocks are geologically important because:
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Plot: Young teenager Momoko Hanasaki is given the power to turn into Wedding Peach, a battle angel charged with protecting love, as well as the Four Sacred Somethings; Four items that hold all love in their balance. Helping Momoko are her friends Yuri and Hinagiku, who have also received the powers of angels, the angel Sir Limone, and Aphrodite, the Goddess of Love.
Keywords: anime, magical-girl, transformation