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Igneous Rocks
All Igneous rocks start out as a liquid form of rock (magma) and then crystallizes or solidifies which then forms the Igneous Rocks. The rock cool quickly on or very close to the surface of the earth. Faster cooling makes the rock too small to see without using magnification. Usually these rocks look shiny and glass-like. Gas bubbles are trapped while cooling, making the rock look like a solid sponge. Examples of Igneous rocks are Basalt, Obsidian, Pumice, Granite, Pegmatite, etc.
Visit other related links : Rocks and Rock Cycle, Metamorphic Rocks and Sedimentary Rocks
All Igneous rocks start out as a liquid form of rock (magma) and then crystallizes or solidifies which then forms the Igneous Rocks. The rock cool quickly on or very close to the surface of the earth. Faster cooling makes the rock too small to see without using magnification. Usually these rocks look shiny and glass-like. Gas bubbles are trapped while cooling, making the rock look like a solid sponge. Examples of Igneous rocks are Basalt, Obsidian, Pumice, Granite, Pegmatite, etc.
Visit other related links : Rocks and Rock Cycle, Metamorphic Rocks and Sedimentary Rocks