If Rocks Could Only Talk, What Would They Tell Us?

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If Rocks Could Only Talk, What Would They Tell Us?
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How Old is the Earth?

• 1 million years old?
• 1 billion years old?
• No!
• 4.6 billion years ago the earth had a violent
  beginning
• Sit back as the story unfolds.
• Once Upon a Time

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PRECAMBRIAN ERA
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PALEOZOIC ERA
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MESOZOIC ERA ALSO KNOWN AS AGE OF THE REPTILES
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CENOZOIC ERA ALSO KNOWN AS AGE OF THE MAMMALS
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How do we Know all This?
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What is Igneous Rock?
Intrusive Granite
Extrusive Obsidian

• Formed from cooling Lava (outside volcano) or
  Magma (inside volcano)
• Extrusive cools outside the Earths Crust
• Intrusive Cools inside the Earth

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What is Sedimentary Rock?

• Formed from Weathering and Erosion
• Types
• Clastic pieces compacted and cemented together
• Chemical formed by evaporation and
  precicpitation
• Organic coming from living organism

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What is Metamorphic Rock?

• Formed by heat and pressure
• Foliated Has bands
• Nonfoliated Has no bands

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How Can We Date Rocks?
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Half-life The time it takes for half the element
to decay