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

If Rocks Could Only Talk, What Would They Tell Us?. 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 …. PRECAMBRIAN ERA. PALEOZOIC ERA.

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

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

  2. 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…

  3. PRECAMBRIAN ERA

  4. PALEOZOIC ERA

  5. MESOZOIC ERA ALSO KNOWN AS “AGE OF THE REPTILES”

  6. CENOZOIC ERA ALSO KNOWN AS “AGE OF THE MAMMALS”

  7. How do we Know all This?

  8. What is Igneous Rock? • Formed from cooling Lava (outside volcano) or Magma (inside volcano) • Extrusive: cools outside the Earth’s Crust • Intrusive: Cools inside the Earth Intrusive: Granite Extrusive: Obsidian

  9. 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

  10. What is Metamorphic Rock? • Formed by heat and pressure • Foliated: Has bands • Nonfoliated: Has no bands

  11. How Can We Date Rocks?

  12. Half-life: The time it takes for half the element to decay

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