There are 3 Major (Geologic) Rock Groups Not the Rolling Stones, Kiss, or Van Halen

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There are 3 Major (Geologic) Rock GroupsNot the
Rolling Stones, Kiss, or Van Halen

• 1. Igneous Rock
• 2. Sedimentary Rock
• 3. Metamorphic Rock
• Rocks are made of minerals
• and make up Earths solid crust

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A. Igneous Rock

• -Forms when a hot, molten liquid, below ground,
  called magma, crystallizes (cools and
  solidifies).
• Magma forms 3 ways
• Rock is heated
• Pressure released
• Change composition

Holt Online Visual Comparing Int. Ext Igneous
Rocks
Basalt lava (glowing rock) oozes over basalt lava
flow
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• Intrusive Igneous Rock
• -Forms or crystallizes inside Earth
• -slow cooling

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• b. Extrusive Igneous Rock
• -Forms on surface (exterior) of Earth
• -Fast cooling

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• Fine-grained-made of interlocking crystals.
• Ex basalt - the most common extrusive igneous
  rock

BASALT
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More Igneous Rocks
Course grained texture Granite, the most common
intrusive.
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Sedimentary Rock

• There are 3 types of sedimentary rocks.
• Often times, sand, mud, pebbles, or shells
  settle out in wind and water, get compacted
  and/or cemented together, and harden into rock.

Here, rocks hardened in layers called strata from
a process known as stratification.
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3 Types of Sedimentary Rock

• 1. Clastic -forms when rock or mineral fragments
  are cemented together.

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• 2. Chemical forms when minerals crystallize out
  of solution, such as sea water, to become rock.

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• 3. Organic forms from the remains of once-living
  plants and animals.
• Ex Limestone
• Coal
• Chalk

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Metamorphic Rock

• -Rocks that have undergone a change in texture,
  structure, or composition.
• -Changes in heat and pressure cause rocks to
  change from one form to another.

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Rocks are made, destroyed, and created again, in
a process called the Rock Cycle