4.2 Restless Continents

Question 1

The hypothesis the states that continents once formed a single landmass, broke up, and drifted to their current locations

Answer 1

Continental Drift

Question 2

The process by which new oceanic lithosphere forms as magma rises towards the surface and solidifies

Answer 2

Sea-floor spreading

Question 3

It is a hypothetical supercontinent that included all current land masses, believed to have been in existence before the continents broke apart during the Triassic and Jurassic Periods.

Answer 3

Pangaea

Question 4

a long, seismically active submarine ridge system situated in the middle of an ocean basin and marking the site of the upwelling of magma associated with seafloor spreading. An example is the Mid-Atlantic Ridge.

Answer 4

Mid ocean ridiges

Question 5

Changes in direction or orientation of the magnetic field of the Earth that have occurred from time to time. (Several hundred are known in the geological record.) Sometimes the north magnetic pole is near the geographic North Pole and sometimes near the South Pole in Antarctica.

Answer 5

Magnetic reversal

Question 6

The remains or physical evidence of an organism preserved by geological processes

Answer 6

Fossils

Question 7

The contribution of a mineral to the total magnetism of a rock depends strongly on the type of magnetic order or disorder. Magnetically disordered minerals

Answer 7

Magnetic Minerals