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Plate Tectonic Theory. TXT pg. 106 Chapter 3…section 5. Definitions to know. Plates: Sections of the lithosphere that are fitted together along cracks Scientific Theory: Well tested concept that explains observations. Theory.

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plate tectonic theory

Plate Tectonic Theory

TXT pg. 106

Chapter 3…section 5

definitions to know
Definitions to know
  • Plates: Sections of the lithosphere that are fitted together along cracks
  • Scientific Theory: Well tested concept that explains observations
  • Pieces of the earth’s lithosphare are in slow, constant motion, driven by convection currents in the mantle.
  • Explains the formation, movement, and subduction of Earth’s plates.
how do they move
  • Movements in the mantle cause the plate to move
  • Gravity pulls one side of the plate down by subduction, causing the rest of the plate to move forward
  • As they move, the collide, pull apart, or grind with other plates
  • This causes the formation of volcanoes, mountain ranges, and deep ocean trenches
plate boundaries
Plate Boundaries
  • Extend into the lithosphere
  • Faults: (Form along the boundaires)Break in the earth’s crust where rocks have slipped past each other
  • 3 Kinds:
    • Divergent
    • Convergent
    • Transform
divergent boundaries
Divergent Boundaries
  • Plates move apart (Diverge)
  • Most occur on mid ocean ridges
  • Can occur on land Causing a Rift valley (deep valley where the plates slide apart
      • Example: Death Valley
convergent boundaries
Convergent Boundaries
  • Where 2 plates come together
  • When they converge, they will collide. Density decides which one gets forced up and which one down….More dense plate sinks under other past
  • Oceanic Crust is more dense than continental crust
  • When continental crust collides, neither is more dense, so mountain ranges form.
transform boundary
Transform Boundary
  • 2 plates slide past each other in opposite directions (Like rubbing your hands together)
  • Crust is not created or destroyed here
  • Earthquakes happen at transform boundaries
pangea proof
Pangea Proof
  • By proving that the earth’s plates are moving, scientists were able to show that there was once a pangea and that the continents broke apart and moved to their current position.
  • Pg. 110 shows this in motion and the time span