Which one of the following is true of most tsunamis?
a. they are faster than seismic surface waves.
b. their wave heights decrease and wavelengths increase as they move into shallower water.
c. they are usually started by sudden movement on a megathrust fault, and have wavelengths that are many kilometers long and wave heights of less than a meter.
d. they only occur in the pacific ocean basin.

C. They are sudden movements and have differential wave frequencies

Explanation:

As Tsunami is mostly a seismic wave that is generated due the sudden movements of megathrust faults one over the another their wavelengths depends on their displacement of trust faults, hence their speeds and heights are marked by the same.

i think it would be cleaveland browns

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.