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Tectonic Plates. Predict the layers:. Corn syrup Water Oil. Layers of Earth. picture. 2 Kinds of Crust. picture. 2 Kinds of Crust. Continental – less dense, thicker Oceanic – more dense, thinner. 2 Kinds of Mantle. Upper – solid, floats on… Lower – plastic (somewhat fluid) Why?.

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predict the layers
Predict the layers:
  • Corn syrup
  • Water
  • Oil
2 kinds of crust5
2 Kinds of Crust
  • Continental – less dense, thicker
  • Oceanic – more dense, thinner
2 kinds of mantle
2 Kinds of Mantle
  • Upper – solid, floats on…
  • Lower – plastic (somewhat fluid)
    • Why?
convection currents
Convection Currents
  • Movement of hot liquid or gas
    • Heated – rises
    • Cools – drops
earth s crust cracks
Earth’s Crust Cracks…
  • Convection currents in mantle cause cracking in crust
crustal plates
Crustal Plates
  • Huge sections of earth’s crust that move relative to each other
types of plate boundaries
Types of Plate Boundaries
  • Divergent
  • Convergent
divergent o to o
Divergent O to O
  • New crust formed and pushed up (ridge)
  • Ex. Mid-Atlantic Ridge
divergent c to c
Divergent C to C
  • Continent spreads, ocean basin may form
  • Ex. Red Sea
ocean to continent
Ocean to Continent
  • Ocean plate goes below continent
    • Subduction
  • Subducted plate partially melts
  • Trenches, volcanic mountains
  • Ex. Western South America
o to o convergent
O to O Convergent
  • Older slips below newer
  • Subducted plate melts
    • Volcanic islands formed
  • Ex. Aleutian islands, Japan
c to c convergent
C to C Convergent
  • Same densities, no subduction
  • Compression, folding, uplifting
  • Ex. Himalayas, Alps
transform faulting
Transform faulting
  • Plates move past each other
activity 3 crustal plates
Activity #3 – Crustal Plates
  • “Connect the dots” – volcanoes and earthquakes
  • Label 8 major plates
pangea theory38
Pangea Theory
  • 1912 – Alfred Wegener
  • Idea that continents were once part of one large land mass – theory of continental drift
how did he know
How did he know?
  • Continents’ shapes fit together like a puzzle
  • Rocks and fossils found on different continents matched
early 1960s
Early 1960s
  • Scientific evidence proves continental drift, plate tectonics, and Pangea theory