if rocks could only talk, what would they tell us?

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

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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. - PowerPoint PPT Presentation

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

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

Page 2: If Rocks Could Only Talk, What Would They Tell Us?

How Old is the Earth?How Old is the Earth?• 1 million years old?1 million years old?• 1 billion years old?1 billion years old?• No!No!• 4.6 billion years ago the earth had a 4.6 billion years ago the earth had a

violent beginningviolent beginning• Sit back as the story unfolds.Sit back as the story unfolds.

Once Upon a Once Upon a TimeTime……

Page 3: If Rocks Could Only Talk, What Would They Tell Us?

PRECAMBRIAN ERAPRECAMBRIAN ERA

Page 4: If Rocks Could Only Talk, What Would They Tell Us?

PALEOZOIC ERAPALEOZOIC ERA

Page 5: If Rocks Could Only Talk, What Would They Tell Us?

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

Page 6: If Rocks Could Only Talk, What Would They Tell Us?

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

Page 7: If Rocks Could Only Talk, What Would They Tell Us?
Page 8: If Rocks Could Only Talk, What Would They Tell Us?

How do we Know all This?How do we Know all This?

Page 9: If Rocks Could Only Talk, What Would They Tell Us?

What is Igneous Rock?What is Igneous Rock?

• Formed from cooling Lava (outside Formed from cooling Lava (outside volcano) or Magma (inside volcano)volcano) or Magma (inside volcano)

• ExtrusiveExtrusive: cools outside the Earth’s Crust: cools outside the Earth’s Crust• IntrusiveIntrusive: Cools inside the Earth: Cools inside the Earth

Extrusive: Obsidian Intrusive: Granite

Page 10: If Rocks Could Only Talk, What Would They Tell Us?

What is Sedimentary Rock?What is Sedimentary Rock?• Formed from Formed from

Weathering and Weathering and ErosionErosion

• TypesTypes::– Clastic: Clastic: pieces pieces

compacted and compacted and cemented togethercemented together

– Chemical: Chemical: formed by formed by evaporation and evaporation and precicpitationprecicpitation

– Organic:Organic: coming coming from living organismfrom living organism

Page 11: If Rocks Could Only Talk, What Would They Tell Us?

What is Metamorphic Rock?What is Metamorphic Rock?• Formed by heat and pressureFormed by heat and pressure• FoliatedFoliated: Has bands: Has bands• NonfoliatedNonfoliated: Has no bands: Has no bands

Page 12: If Rocks Could Only Talk, What Would They Tell Us?

How Can We Date Rocks?How Can We Date Rocks?

Page 13: If Rocks Could Only Talk, What Would They Tell Us?

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