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continental divide
chapter10 - Pearson
16
Science
7th Grade
02/27/2012
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Term
Pangaea
 Definition

the name of the single landmass that began to break apart 200 million years ago

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Term
fossil
 Definition
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Term
mid-ocean ridge
 Definition

an undersea mountain chain where new ocean floor is produced; a divergent plate boundary under the ocean

Term
sea-floor spreading
 Definition

the process by which molten material adds new oceanic crust to the ocean floor

Term
deep-ocean trench
 Definition

 

a deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle

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Term
subduction
 Definition

the process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle

Term
plate
 Definition
a section of the lithosphere that slowly moves over the asthenosphere, carrying pieces of continental and oceanic crust
Term
transform boundary
 Definition

a plate boundary where two plates moving past each other in opposite directions

Term
rift valley
 Definition

a deep valley that forms where two plates move apart

Term
convergent boundary
 Definition

a plate boundary where two plates move toward each other

Term
plate tectonics
 Definition
the theory that pieces of Earth's lithosphere are in constant motion, driven by convection currents in the mantle
Term
fault
 Definition

a break in Earth's crust along which rocks move

Term
Wegener's hypothesis
 Definition

a German scientist who thought that all the continents were once joined together in a single landmass and have since drifted apart

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Term
continental drift
 Definition

the hypothesis that the continents slowly move across Earth's surface

Term
Glossopteris
 Definition

fernlike plant that lived 250 million years ago, fossils found in continents that are now separated

Term
Mesosaurus and Lystrosaurus
 Definition

freshwater reptiles whose fossils have been found in places now separated by oceans

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