Some geographers estimate that around 300 c. e., polynesians may have reached the western coast of where they learned about the sweet potato.
a. south america
b. africa
c. north america
d. australia

seismic wave -

an elastic wave in the earth produced by an earthquake or other means.

explanation:

a mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics. this uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary.a geomagnetic reversal is a change in a planet's magnetic field such that the positions of magnetic north and magnetic south are interchanged.