6th Grade-Ch. 5 Sec. 2 Igneous Rocks
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Transcript of 6th Grade-Ch. 5 Sec. 2 Igneous Rocks
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Ch. 5 Sec. 2 Igneous Rocks
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igneous rockigneous rock – – formed from magma or lavaformed from magma or lava
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classified by
1. origin 2. texture3. mineral
composition
where formed?
on or beneathEarth’s surface
depends on size & shape
of mineral crystals
Silica content
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1. origin
• extrusive rock= formed from lava on Earth’s surface
–ex. basalt
• intrusive rock= formed from magma below Earth’s surface
–ex. granite
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2. texture• depends on size & shape of mineral crystals
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different textures
1. fine-grained • small crystals• rapid cooling
2. coarse-grained • large crystals • slow cooling
3. porphyritic • large crystals surrounded by smaller crystals• forms when magma cools slowly- then rapidly
4. glassy • no crystals form • extremely rapid cooling
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coarse-grained fine-grained
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porphyritic
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3. mineral composition
• lava low in silica dark colored rocks
• lava high in silicalava high in silica light colored rocks light colored rocks
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uses of igneous rocks
• hard, dense, & durable
• ex:
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• granite• building material
statuesfloors
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basalt• makes gravel in construction
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What does igneous rock form from?
magma or lavamagma or lava
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How are igneous rocks classified?
• according to:
1.origin
2.texture
3.mineral composition
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Why have people throughout history used igneous rocks for tools and building materials?
• They are hard, dense, & durable.
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What igneous rock is used to make gravel in construction?
basalt
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What type of igneous rock formed from lava on Earth’s surface ?
extrusive rock
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What type of igneous rock formed from magma below Earth’s surface ?
intrusive rock