6.3 Seafloor Spreading

Question 1

Asthenosphere

Answer 1

The deeper part of Earth’s mantle beneath the lithosphere. The rocks of the asthenosphere are able to slowly flow because of the immense pressures at depth.

Question 2

Geomagnetic reversal

Answer 2

A major change in the direction of Earth’s magnetic field.

Question 3

Seafloor spreading

Answer 3

The theory that states that new oceanic crust forms at mid-ocean ridges and then slowly moves away from the ridge crest.