Rocks 8.3.4 Explain how igneous, metamorphic, and

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Rocks

• 8.3.4 Explain how igneous, metamorphic, and
  sedimentary rocks are interrelated in the
• rock cycle.

Students do not need to know the examples of each
type of rock shown in this powerpoint. They are
for information only.
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Each type of rock is formed differently and can
change fromone type to another over time.
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Types of Rocks
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Sedimentary RocksHow They are Made

• Forms from the compaction and/or cementation of
  rock pieces, mineral grains, or shell fragments
  called sediments.
• Sediments are formed through the processes of
  weathering and erosion of rocks exposed at
  Earths surface.
• Sedimentary rocks can also form from the chemical
  depositing of materials that were once dissolved
  in water.

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Types of Sedimentary Rocks
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Igneous RocksWhat are They?

• Forms when molten rock (magma) cools and
  hardens.
• If cooling takes place slowly beneath Earths
  surface, the igneous rock is called intrusive.
• If the cooling takes place rapidly on Earths
  surface, the igneous rock is called extrusive.

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Types of Igneous Rocks
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Metamorphic RocksWhat are They?

• Forms when rocks are changed into different kinds
  of rocks by great heat and/or pressure.
• They are heated, squeezed, folded, or chemically
  changed by contact with hot fluids.

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Types of Metamorphic Rocks
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Rock Cycle

• The rock cycle is an ongoing process.
• It is a series of natural processes that can
  change rocks from one kind to another.
• Check out the diagram on the next slide!

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Rock Cycle
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Rocks

• 8.3.4 Explain how igneous, metamorphic, and
  sedimentary rocks are interrelated in the
• rock cycle.