Rocks: Mineral Mixtures

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Rocks Mineral Mixtures

• 8th Grade

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Section 1Understanding Rock

• What exactly is rock?
• A solid mixture of crystals of one or more
  minerals, that range in all sizes from pebbles to
  formations that are thousands of kilometers long.

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The Value of Rock

• Rock is an important natural resource.
• Used by early humans to make tools such as
  hammers, spears, knives, and scrapers.
• Used for centuries to make buildings, roads, and
  monuments.
• Certain types of rocks have helped build ancient
  and modern civilizations.
• Rock study has helped scientists to discover the
  history of life on Earth.

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Machu Picchu, Peru 600 A.D. Ancient Civilization
Rock Structure
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Fossils

• Help provide information of life forms that lived
  thousands of years ago.

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The Rock Cycle

• Rocks in the Earths crust are constantly
  changing shape and composition.
• The way the rock forms determines the type of
  rock that it is.
• The three main types of rocks are igneous,
  sedimentary, and metamorphic.