The term “seafloor spreading" is best used to describe-* the rapid drop off between the continental shelf and the abyssal plain.
the submergence of the Pacific plate beneath the North American plate.
the tsunami effect associated with the eruption of underwater volcanoes.
magma upwelling and lateral expansion along the mid-Atlantic ridge

magma upwelling and lateral expansion along the mid-Atlantic ridge

Explanation:

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.