3 types of rocks by Reagan Alexander

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Slide Notes

3 types of rocks

Published on Nov 23, 2015

3 types of rocks, by Reagan Alexander

PRESENTATION OUTLINE

3 TYPES OF ROCKS

IGNEOUS, SEDIMENTARY, METAMOROHIC

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Rocks-
A rock is a combination of one or more minerals or organic matter

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How are rocks classified?

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Number 1-
Mineral composition
The mineral and organic matter a rock contains

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Number 2-
Texture
The size, shape and position of the grains that make up a rock

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IGNEOUS ROCK

FORMED WHEN HOT MAGMA COOLS INTO SOLID ROCK

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Intrusive igneous rocks-
When magma intrudes surrounding rock below
Example- granite

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Extrusive Igneous Rock-
Forms when magma erupts onto earths surface
Example- basalt

Photo by James St. John

SEDIMENTARY

OCCUR AT THE EARTHS SURFACE THROUGH WEATHERING AND EROSION

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Number 1-
Clastic Sedimentary
Forms when sediments are buried, compacted, and cemented together by Calcite or Quartz
Example- sandstone

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Number 2-
Chemical Sedimentary
Forms when water evaporates and the dissolved minerals get left behind
Example- halite

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Number 3-
Organic Sedimentary
Forms from the fossils of plants and animals
Example- coal

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METAMORPHIC ROCKS

FORMS WHEN A ROCK IS EXPOSED TO HIGH TEMPERATURE

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Number 1-
Foilated Metamorphic
When mineral grains are arranged in planes
Example- slate

Photo by Albert Freeman

Number 2-
Nonfoilated Metamorphic
When minerals don't have mineral grains that are aligned in planes
Example- marble

Photo by whisperwolf

Reagan Alexander