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Ferg Plate Tectonics

Plate Tectonics Pg 89-101

TermDefinition
Pangaea A single large landmass 245 million years ago.
Sea-floor Spreading Molten rock from inside the Earth rises through cracks on the seafloor and cools to form new oceanic crust.
Uplift Rising of the crust to higher elevations.
Subsidence Sinking of parts of the crust to lower elevations.
Rift zone An area where deep cracks form. Found where tectonic plates are moving apart.
Plate tectonics Large scale movements of the Earth's lithosphere.
Tectonic plates Pieces of the lithosphere that are broken up and move around on top of the asthenosphere.
Convergent boundaries Form where tectonic plates collide or run into each other.
Divergent Boundaries Plates that move away from each other or divide.
Transform boundaries Place at which 2 plates move past each other horizontally.
Convection Movement of material due to differences in density. Warm rises and cools sinks.
Hot spot Location where a column of extremely hot rock -- a mantel plume-- rises through the asthenosphere. Hawaii is an example.
Created by: Mrsfergy
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