A geologic feature of divergent plate boundaries in oceanic crust is the formation of

a. trenches.

c. U-shaped valleys.

b. fossils.

d. rift valleys.

D. rift valleys.

Trenches occur at convergent oceanic plates; fossils are extremely old bones, bodies, or footprints, which have gotten so old the intervening years have turned them into rock; U-shaped valleys are valleys which are shaped like the letter U, and are usually formed by glaciers, which tend not to occur underwater very often.