Ageologic 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. 

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