The rate of seafloor spreading can be calculated by
A)the magnetic pattern generated at the ocean floor.
B)knowing the dates for magnetic pole reversals,and the distance from the location of a known reversal site to the ocean ridge.
C)looking at the magnetic tape recording of the ocean floor.
D)the rate of seafloor spreading cannot be calculated.

Question

Quizplus · Accepted Answer

The rate of seafloor spreading can be calculated by knowing the dates for magnetic pole reversals and the distance from the location of a known reversal site to the ocean ridge. As the seafloor spreads, volcanic rocks are erupted and the magnetic minerals in the rocks align with Earth's magnetic field. The magnetic polarity of rocks on either side of the ridge alternates, creating a magnetized "striped" pattern on the ocean floor. By dating the rocks and measuring the distance between the magnetic stripes, the rate of seafloor spreading can be calculated.

The Rate of Seafloor Spreading Can Be Calculated by