Question

what pattern did scientists observe in the magnetic polarity of the seafloor?
random distribution
normal at mid - ocean ridges, reversed in symmetrical patterns on either side
reversed at mid - ocean ridges and normal spread out on either side
a non - symmetrical striped pattern

Explanation:

When studying the magnetic polarity of the seafloor, scientists observed that there is a pattern where normal polarity is at mid - ocean ridges and reversed polarity spreads out symmetrically on either side. This is due to the process of seafloor spreading. As new magma rises at the mid - ocean ridges and cools, it records the Earth's magnetic field at that time. Over time, as the magnetic field reverses, these polarity changes are recorded in the newly formed oceanic crust on either side of the ridge in a symmetrical pattern.

Answer:

Normal at mid - ocean ridges, reversed in symmetrical patterns on either side.