classification of rocks...result from the cooling of molten (melted) rock material. the cooling...
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Classification of Rocks
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1. How do the crystals or minerals form in a rock?
2. Why do some rocks have layers?
3. Why do some rocks have rounded particles while others have angular particles?
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Are combinations of two or more minerals.
They can be grouped into three families depending on how they are formed.
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Result from the cooling of molten (melted) rock material.The cooling creates crystals in the rocks.Basalt and granite are the most common.
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Lava Magma
Above the ground
Below the ground
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Intrusiveformed below the surface of the Earth.
Rocks cool very slowly.
They have large crystals.
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Gabbro
Granite
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ExtrusiveFormed above the Earth’s surface.
Rocks cools quickly.
They have small crystals.
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Basalt
RhyoliteObsidian
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Form from the compaction and cementation (lithification) of sediments into visible layers called beds.
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Small particles (silt or mud)
Shale
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Medium Particles (sand –can roll between your fingers)
Sandstone
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Large Particles (gravel)
Conglomerate
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Plant and animal particles
Limestone
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Result when pre-existing rocks (parent rocks) undergo changes due to heat, pressure and water.This is a long and slow process.
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PARENT: Shale
Sedimentary Metamorphic
Slate
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PARENT: Limestone
Sedimentary Metamorphic
Marble
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PARENT: Sandstone
Sedimentary Metamorphic
Quartzite
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PARENT: Granite
Igneous Metamorphic
Gneiss