Question

the aden ridge began to form millions of years ago as the somalian plate and the arabian plate moved away from each other. the plates are slowly moving apart at a rate of about 2 centimeters per year. on the map, the ridge is shown in the gulf of aden, between the countries of somalia and yemen.
complete the sentence.
the aden ridge formed at a ______ boundary.
convergent
divergent
transform

Explanation:

Divergent plate boundaries occur when tectonic plates move away from each other, which creates new crust and can form underwater ridges like the Aden Ridge, as described by the plates moving apart here. Convergent boundaries involve plates colliding, and transform boundaries involve plates sliding past each other, which do not match the formation of the Aden Ridge.

Answer:

divergent