Introduction to Rocks

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Introduction to Rocks

• 7th grade science

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What are rocks?

• Rocks are a combination of minerals

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Are all rocks the same?

• No
• Not only are they different colors, but there are
  also different types
• The three main types are igneous, sedimentary,
  and metamorphic rocks.

Igneous Granite
Metamorphic Gneiss
Sedimentary Sandstone
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Where do rocks come from?

• Rocks are created, transformed, and destroyed in
  a process called the rock cycle
• Interactive Rock Cycle Animation

http//www.cotf.edu/ete/modules/msese/earthsysflr/
rock.html
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The rock cycle Part 1

• First of all there is no real beginning or end to
  the rock cycle.
• However, for this lesson we will begin with
  igneous rocks.
• Igneous rocks often forms when lava erupts from
  volcanoes then cools.

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Igneous Rocks

• Can be
• Shiny
• Crystalline
• Porous

http//geology.about.com/library/bl/images/blrocki
ndex.htm
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The rock cycle Part 2

• Secondly, the rock cycle is not a perfect circle,
  it does not occur in a specific sequence.
• Igneous rocks can be re-melted, eroded, or
  pressed.
• Rocks that are formed from eroded sediment are
  Sedimentary Rocks.

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Sedimentary Rocks

• Can be
• Grainy, Sandy
• Made of different pieces of rocks or minerals
• Striped

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The rock cycle Part 3

• Finally, rocks can be transformed over time to
  make new rocks.
• Heat and pressure can create new rocks
• These rocks are called Metamorphic rocks.

http//www.tulane.edu/sanelson/geol111/metamorphi
c.htm
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Metamorphic Rocks

• Come in a variety of styles, shapes and colors
• Many have stripes, but not all
• Many contain unique crystal and mineral
  formations only unique to metamorphic rocks

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Review

• There are review questions about rocks on the
  following slides.
• In order to progress through the quiz in the
  correct order you have to click the links on the
  slides.
• Click the Begin Quiz link on this page to start
  the quiz.
• Begin Quiz

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1. True or False The rock cycle always starts
with igneous rocks and ends with metamorphic
rocks.

1. True
2. False

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Correct! Click to Continue
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2. True or False The rock cycle does not always
follow the same order.

1. True
2. False

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3. Igneous rocks

1. Can be formed from pieces of sediment that have
   been compacted and glued together.
2. Can be formed from molten magma or lava.
3. Are formed when heat and pressure transform old
   rocks into new rocks.

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4. Sedimentary rocks

• Can be formed from pieces of sediment that have
  been compacted and glued together.
• Can be formed from molten magma or lava.
• Are formed when heat and pressure transform old
  rocks into new rocks.

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5. Metamorphic Rocks

• Can be formed from pieces of sediment that have
  been compacted and glued together.
• Can be formed from molten magma or lava.
• Are formed when heat and pressure transform old
  rocks into new rocks.

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The End
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References

• http//www.cotf.edu/ete/modules/msese/earthsysflr/
  rock.html
• http//geology.about.com/library/bl/images/blrocki
  ndex.htm
• http//www.tulane.edu/sanelson/geol111/metamorphi
  c.htm