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Tectonic Plates Engl

English

TermDefinition
Tectonic Plates The Earth's crust is broken up into pieces or plates that move while floating on denser mantle
Crust The rigid outer part of the Earth's layers
Continental Crust Thicker, older, less dense, made of granite
Oceanic Crust Thinner, younger, denser, made of basalt
Plate Boundary The place where two tectonic plates meet
Convergent Boundary Two tectonic plates move together
Divergent Boundary Two tectonic plates move apart
Transform Boundary Two tectonic plates move past each other
Subduction Zone When two plates converge and the denser one goes under the less dense one (typically oceanic below continental), can form volcanoes
Mountain Range When two plates converge and fold pushing their crust up to form a mountain (usually continental-continental interaction)
Earthquake A sudden and violent shaking of the ground as a result of movements of the Earth's crust
Island Arcs Series of islands formed as a result of denser and older oceanic crust sinking under less dense younger oceanic crust
Hot Spots A point in the Earth's crust that has a hot upwelling of magma that forms a chain of islands as the tectonic plate moves over the hot spot
Faults A fracture or zone of fractures between two blocks of rocks, which all the rocks to move relative to one another
Mid-ocean ridge A ridge system located where two plates are diverging and magma upwells to create new oceanic crust
Sea floor spreading The outward movement of the seafloor as new crust is formed at a mid-ocean ridge pushing the older seafloor away
Theory of Continental Drift Originated by Alfred Wegner- the theory that Earth's continents have moved over geologic time relative to each other
Plate Tectonics Theory Theory of motions at the Earth's surface and creation of major landforms as a result of the movement of tectonic plates
Created by: user-1765500
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