Where is oceanic crust thickest? a. at mid-ocean ridges b. in the center of ocean plains c. at deep-sea trenches d. none of the above

The oceanic crust is thickest at MID OCEAN RIDGES.

Oceanic crust refers to the thin portion of the earth crust that is located under the ocean basin. It is the uppermost layers of the oceanic part of a tectonic plate and it is about six kilometers or four miles thick at the mid ocean ridge. Ocean ridge is formed as a result of rising up of magma from the asthenosphere.

smooth muscle is composed of involuntary muscles found within the walls of organs and structures such as the esophagus, stomach, intestines, and blood vessels. those muscles push materials like food or blood through organs. unlike skeletal muscle, smooth muscle can never be under your control.

i think that the answer is c