Our Rocky World

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Our Rocky World
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The Earth is made up of three basic types of
rocks.

• Sedimentary
• Igneous
• Metamorphic

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Minerals

• These types of rocks are all made of different
  types of minerals. Minerals are things found in
  nature and are not man made.

Gold
Metal
Diamond
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Igneous Rock

• Igneous rocks are called fire rocks and are
  formed either underground or above ground.
  Underground, they are formed when the melted
  rock, called magma, deep within the earth becomes
  trapped in small pockets. As these pockets of
  magma cool slowly underground, the magma becomes
  igneous rocks.

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Igneous Rock

• 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.

Pumice
Granite
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Sedimentary Rock

•   A sedimentary rock can be formed from many
  things. They can be formed from layers of other
  rocks, dead plants, animals, or sand. The grains
  are where the layers were formed. The layers have
  to be pushed together very tightly. 

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Sedimentary Rocks

• You could find sedimentary rocks near water. If
  you go to a lake and try to skip a rock it most
  likely is a sedimentary rock. They are the ones
  that usually are stuck in sediment.     If you
  look closely on a sedimentary rock you'll see
  smaller rocks inside. 70 of rocks are
  sedimentary rocks.

Sandstone
Coal
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Metamorphic Rock

• 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 and tons of pressure, which fosters heat
  build up, and this causes them to change. If you
  exam metamorphic rock samples closely, you'll
  discover how flattened some of the grains in the
  rock are.

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Metamorphic Rock

• Examples

Gneiss
Schist
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Rock Cycle

• The rock cycle is an ongoing process where rocks
  form and change into other types of rocks. Rocks
  are always changing. Minerals that make up rocks
  are always being shifted around by the
  environment. Some rocks turn into entirely new
  rocks! The rock cycle never stops!

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Rock Test

• Click on the web site below and test your
  knowledge about rocks.
• http//www.fi.edu/fellows/fellow1/oct98/quiz/index
  .html