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Igneous Rocks

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emma Anderson

on 4 February 2013

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Transcript of Igneous Rocks

Some examples of the common Igneous
rocks are Basaltic, Granitic, and Andesitic.

An Andesite rock is can be grey or black. The Andesite rock has small crystals. Andesite has mineral compositions of basaltic and granitic rocks. It forms with a high concentration of silica. Igneous Rocks Igneous Rocks can be classified as Intrusive, Extrusive, and volcanic. Basaltic

Basaltic is a dense, dark-colored rock
that contains a high level of iron.
Most of the earth's crust is made
up of this. To rise to the surface, it oozes out of cracks in the ocean floor or spills out of volcanoes. Granitic

Granitic rocks are are light colored rocks. Because Granitic magma is so stiff, it can build up a great amount of gas pressure,which is released explosively during violent eruptions to rise. Intrusive Rocks

Erosion pushes the rocks up and surrounds others and eventually compacts.
Intrusive rocks are light colored. Extrusive Rocks

Lava flows to the surface, and is exposed to air and water, then cools quickly.
Extrusive rocks are light colored. Volcanic glass rocks

It cools so quickly, that no mineral grains have time to gather, and gas gets trapped, forming glass. Volcanic glass is non-metallic and has dents and sharp ridges. Lava Formation

In the ground, rocks, and rock sediments melt to form Molten rock also know as Magma. Once it has formed magma, it rises the the surface because it is extremely hot and less dense.
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