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Earth Science Chapter 8
Vocabulary for Chapter 8
17
Science
12/07/2009

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Term
Collision Boundary
Definition
a convergent boundary with 2 continents have come together and are welded into a single , larger continent
Term
Continental Drift
Definition
A hypothesis that Earth's continents move on Earth's surface
Term
Convergent Boundary
Definition
a boundary between 2 plates that are moving towards each other
Term
Craton
Definition
ancient core of a continent, which is tectonically stable
Term
Deep-Sea Trench
Definition
long, narrow steep-sided trough that runs parallel to continental margins or to volcanic island chains
Term
Divergent Boundary
Definition
a boundary between 2 lithospheric plates that are moving apart
Term
Mantle Convection
Definition
process by which heat from earth's inner and outer cores is transferred through the mantle
Term
Mid Ocean Ridge
Definition
long chain of mountains with a central rift valley that is located along a divergent boundary on the ocean floor
Term
Pangaea
Definition
hypothetical landmass consisting of all the continents welded together; existed about 250 million years ago
Term
Plate Tectonics
Definition
theory that the lithosphere is  made of plates that move and interact with each other at their boundaries
Term
Ridge Push
Definition
force that is exerted by cooling, subsiding rock on the spreading lithospheric plates at a mid-ocean ridge
Term
Rift
Definition
crack or opening in Earth's crust
Term
Rift Valley
Definition
deep valley at a point where lithospheric plates are moving apart, such as at a mid-ocean ridge
Term
Slab Pull
Definition
force at a subduction boundary that the sinking edge of the subducting plate exerts on the rest of the plate
Term
Subduction Boundary
Definition
convergent boundary where an oceanic plate is plunging beneath another, overriding plate
Term
Terrane
Definition
large block of lithospheric plate that has been moved, often over a distance of thousands of kilometers and attached to the edge of a continent
Term
Transform Boundary
Definition
boundary between 2 plates that are sliding past each other