Continental Drift & Development of a Theory

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7 Terms

1

Mid-Ocean Ridge

Mountain ranges in the middle of the ocean. Site of new oceanic crust.

2

Seafloor Spreading

Process by which new oceanic crust forms along a mid-ocean ridge and the older oceanic crust moves away from the ridge.

3

Normal Polarity

State in which magnetized objects, such as compass needles, will orient themselves to point north.

4

Magnetic Reversal

When the magnetic field reverses direction.

5

Reversed Polarity

State in which magnetized objects would reverse direction and orient themselves to point south.

6

Pangaea

Supercontinent proposed by Alfred Wegener.

7

Continental Drift

Hypothesis proposed by Wegener which suggested that continents are in constant motion on the surface of the Earth.