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Ch. 4 Vocab Words
Chapter 4 Plate Tectonics Vocab. Words
17
Science
7th Grade
11/05/2013

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Term
Pangaea
Definition
Supercontinent
Term
Continental Drift
Definition
Continents are in constant motion on the surface of Earth
Term
Fossil
Definition
Naturally Preserved remains, imprints, or traces of organisms that lived long ago
Term
Mid-Ocean Ridges
Definition
Mountain ranges in the middle of the oceans
Term
Seafloor Spreading
Definition
Process by which new oceanic crust forms along a mid-ocean ridge and older oceanic crust moves away from the ridge
Term
Normal Polarity
Definition
State in which magnetized objects, such as compass needles, will orient themselves to point north
Term
Magnetic Reversal
Definition
Magnetic Field reverses direction
Term
Reversed Polarity
Definition
State in which magnetized objects would reverse direction and orient themselves to point south
Term
Plate Tectonics
Definition
States that Earth's structure is made of rigid slabs or rock, or plates that move with respect to each other
Term
Lithosphere
Definition
Cold and rigid outermost rock layer
Term
Divergent Plate Boundary
Definition
Forms where two plates separate
Term
Transform Plate Boundary
Definition
Forms where two plates slide past each other
Term
Convergent Plate Boundary
Definition
Form where two plates collide.
Term
Subduction
Definition
Denser plate sinks below the more buoyant plate
Term
Convection
Definition
Circulation of material caused by differences in temperature
Term
Ridge Push
Definition
Rising mantle material at mid-ocean ridges creates the potential for plates to move away from the ridge with force
Term
Slab Pull
Definition
Slab sinks, it pulls on the rest of the plate with a force
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