Igneous Rocks. Igneous rocks  Are rocks formed from solidified/cooled magma  Are made of interlocking crystals  Interlocking crystals make strong rock.

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Presentation transcript:

Igneous Rocks

Igneous rocks  Are rocks formed from solidified/cooled magma  Are made of interlocking crystals  Interlocking crystals make strong rock resistant to weathering and erosion

Igneous rock formation

Igneous rocks  Contain silicate minerals; atoms of silicon and oxygen and other minerals

Igneous rocks  Are identified by 1) color 2) crystal size

Intrusive igneous rock  Is rock formed/cooled inside the earth’s crust  Cools slowly and forms larger crystals

Vietnam veterans memorial black granite

Extrusive igneous rock  Rock that forms when lava cools  Cooling is faster so crystals form more quickly and are smaller

obsidian

basalt

Igneous Rock  om/hsw/8447-basics-of- geology-igneous-rock- video.htm om/hsw/8447-basics-of- geology-igneous-rock- video.htm om/hsw/8447-basics-of- geology-igneous-rock- video.htm  om/hsw/8447-basics-of- geology-igneous-rock- video.htm om/hsw/8447-basics-of- geology-igneous-rock- video.htm om/hsw/8447-basics-of- geology-igneous-rock- video.htm  om/hsw/10466-forces-that- shape-the-earth-igneous- rocks-video.htm om/hsw/10466-forces-that- shape-the-earth-igneous- rocks-video.htm om/hsw/10466-forces-that- shape-the-earth-igneous- rocks-video.htm  om/hsw/5929-geology-the- structure-of-the-earth- video.htm

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