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Rocks

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* There are three main types of rocks: Igneous - formed when molten rock cools. Sedimentary formed by the cementing together of small grains of sediment. – PowerPoint PPT presentation

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Title: Rocks


1
Rocks
2
Types of Rocks
  • There are three main types of rocks
  • Igneous - formed when molten rock cools.
  • Sedimentary formed by the cementing together
    of small grains of sediment.
  • Metamorphic rocks changed by the effect of heat
    and pressure.

3
Igneous Rocks
4
Igneous Rock Types
  • There are two types of igneous rocks
  • Extrusive- igneous rocks that form on the surface
  • Intrusive- igneous rocks that form under the
    surface

5
Igneous Rocks
  • These are rocks formed by the cooling of molten
    rock (magma.)

Magma cools and solidifies forming igneous rocks
6
Rate of Cooling
  • The rate magma cools will determine the size of
    the crystals
  • Igneous rocks that cool slowly will form very
    large crystals
  • Igneous rocks that cool rapidly will form very
    small crystals

7
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8
Texture
  • Texture describes the overall appearance of
    igneous rocks based on the size and arrangement
    of crystals
  • Fine grained texture
  • Course gained texture
  • Glassy texture

9
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12
Sedimentary Rocks
13
Sedimentary Rocks
  • Sedimentary rocks are compacted sediments
  • Sedimentary rocks make up about 5 percent of the
    rocks on Earths crust

14
Sedimentary Rocks roll in History
  • Fossils are found in sedimentary rocks
  • 75 percent of rock on the continents are
    sedimentary
  • From sedimentary rocks geologist can reconstruct
    details of Earths history

15
Sedimentary Rocks
  • Sedimentary Rocks are rocks formed when particles
    of sediment build up and are cemented together
    by the effect of pressure and minerals.

16
Metamorphic Rocks
17
Metamorphic Rocks
  • Metamorphic rocks are formed by the effect of
    heat and pressure on existing rocks.
  • This can greatly affect the hardness, texture or
    layer patterns of the rocks.

18
Rock Cycle
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