Rocks

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Rocks
ROCKS
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What is a Rock?

• Any solid mass of mineral or mineral-like matter
  that occurs naturally as part of our planet
• 3 types
• Igneous
• Sedimentary
• Metamorphic

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The Grand Canyon
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The Rock Cycle

• Interactions among Earths water, air, land, and
  living things can cause rocks to change from one
  type to another
• A continuous process

ROCK CYCLE VIDEO
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Plate Tectonics
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What is Continental Drift

• Proposed by Alfred Wegener
• Stated that the continents had once been joined
  to form a single supercontinent
• Wegeners Theory
• Pangaea broke apart 200 MY
• Continents drifted
• Continents broke through the oceans

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Evidence of Continental Drift

• Shorelines look like they fit together
• Fossil organisms found on different landmasses
• Several mountain belts end at one coastline, only
  to reappear on a landmass across the ocean
• Ancient Climates

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Matching Mountain Ranges
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Glacier Evidence
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The Theory of Plate Tectonics

• Proposes that Earths outer shell consist of
  individual plates that interact in various ways
  and thereby produce earthquakes, volcanoes,
  mountains, and the crust itself

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Pangaea

• Occurred 500 MY
• Continents breakup begins 200 MY
• North America and Africa split 135 MY

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Earths Major Plates

• The lithosphere floats and moves along the mantle
• Top 7 Plates Remaining Plates
• African Arabian
• Antarctic Caribbean
• Eurasian Cocos
• Australian-Indian Nazca
• North American Philippine
• Pacific Scotia
• South American

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Exit Ticket

• In your own words, explain plate tectonics.