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Earth Science
Chapter 8
17
Science
09/27/2012

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Term
collision boundary
Definition
A convergent boundary where two 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
craton
Definition
The ancient core of a continent, which is tectonically stable.
Term
deep sea trench
Definition
Long trench that is the deepest part of the ocean
Term
divergent boundary
Definition
A boundary between two lithospheric plates that are moving apart.
Term
mantle convection
Definition
A process by which heat from Earth's inner and outer cores is transferred through the mantle.
Term
mid-ocean ridge
Definition
A long chain of mountains with a central rift valley that is located along a divergent boundary on the ocean floor
Term
Pangaea
Definition
The name of a hypothetical landmass consisting of all the continents welded together, which evidence indicates existed about 250 million years ago.
Term
plate tectonics
Definition
The theory that the lithosphere is made of plates that move and interact with each other at their boundaries.
Term
ridge push
Definition
A force that is exerted by cooling, subsiding rock on the spreading lithospheric plates at a mid-ocean ridge.
Term
convergent boundry
Definition
a boundry between two plates that are moving twords each other or converging
Term
rift
Definition
a crack or opening in the earths crust
Term
rift valley
Definition
a deep valley at a point where the lithosperic plates are moving apart such as at the mid ocean ridge
Term
slab pull
Definition
a force of subduction boundry that the sinking edge of the subducting plate exerts on the rest of the plate
Term
subduction boundary
Definition
a convergant boundry where oceanic plates plunge over an overiding plate
Term
terrane
Definition
a large block of plate that has been moved thousands of kilometers and attaches to an edge of an continent
Term
transform boundary
Definition
a boundary from two plates that slide past each other