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Desai science
Plate tectonics
15
Geology
7th Grade
12/17/2012

Additional Geology Flashcards

 


 

Cards

Term
Alfred Wegner
Definition
proposed theory of continental drift 
Term
Harry Hess 
Definition

proposed seafloor spreading

[image]

proposed seafloor spreading

[image]
 
Term
Pangaea 
Definition
the original land mass
Term
clues that back up continental drift 
Definition
1) fossil of similar plants and animals found all over the world
2) glacier evidence in warm climates
3) similar rock types found on both sides of the Atlantic Ocean 
Term
continental collision 
Definition
two continental plates coming together (ex. - India and Asia) 
Term
continental drift 
Definition
the theory that the continents have moved slowly to their current location 
Term
convection current 
Definition
current in mantle that moves overlying tectonic plates (crust) 
Term
convergent boundary 
Definition
where two tectonic plates come together (ex. - subduction, continental collision) 
Term
divergent boundary 
Definition
where two plates pull/move apart (ex. - seafloor spreading, rift valley) 
Term
plate tectonics 
Definition
theory that crust is broken up into sections that move on mantle 
Term
rift valley 
Definition
two continental plates moving apart 
Term
seafloor spreading 
Definition
two oceanic plates moving apart  [image]
Term
Seafloor spreading 
Definition
theory proposing that magma under crust moves crustal plates apart 
Term
subduction 
Definition
denser oceanic plate colliding and going underneath less dense continental plate 
Term
transform boundary 
Definition
tectonic plates move sideways past each other 
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