Types and Characteristics

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Types and Characteristics

• ROCKS

• By Mrs. Clement

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Credits

• http//sln.fi.edu/fellows/fellow1/oct98/create/ind
  ex.html

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Types

• Sedimentary
• Igneous
• Metamorphic
• Rock Cycle

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Sedimentary Rocks

• For many years, pieces of our earth have been
  eroded--broken down and worn away by wind and
  water. These sediments are washed downstream
  where they settle to the bottom of the rivers,
  lakes, and oceans. Layer after layer is deposited
  on top of each. The layers are compacted
  throughout time, until the bottom layers turn
  into rock.

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Sedimentary Rocks

• Characteristics
• 1) Formed by Cementation and Compaction of
  sediments
• 2) Layers
• 3) Contain Fossils
• 4) Covers 2/3 of the Earths Crust
• 5) Mud Cracks and Ripple Marks

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Sedimentary Rocks
Gypsum
Conglomerate
Shale
Limestone
Sandstone
Rocky Mountains
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Igneous Rocks

• Igneous rocks,called fire rocks, are formed
  underground or above ground. Underground, they
  are formed when magma deep within the earth
  becomes trapped in small pockets. As these
  pockets of magma cool slowly underground, the
  magma becomes igneous rocks.
• Igneous rocks are also formed when volcanoes
  erupt, causing the magma to rise above the
  earth's surface. When magma appears above the
  earth, it is called lava. Igneous rocks are
  formed as the lava cools above ground.

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Igneous Rocks

• Characteristics
• 1) Solidification or cooling of magma
• 2) Vesicular or Glassy Texture
• 3) Crystals
• 4) Makes up Continental and Oceanic Crusts

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Igneous Rocks
Granite Continental Crust
Basalt Oceanic Crust
Pumice
Obsidian Volcanic Glass
Scoria
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Metamorphic Rocks

• Metamorphic rocks are rocks that have "morphed"
  into another kind of rock. These rocks were once
  igneous or sedimentary rocks. How do sedimentary
  and igneous rocks change? The rocks are under
  tons of pressure, which causes heat to build,
  that causes them to change.

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Metamorphic Rocks

• Characteristics
• 1) Change rock by heat and/or pressure
• 2) Foliated (Mineral Alignment)
• 3) Banding

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Metamorphic Rocks
Slate
Gneiss
Schist
Marble
Hornfels
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Rock Cycle
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