Why do convergent oceanic plates subduct, but continental plates do not usually respond in this way?

a. oceanic plates and continental plates are about the same density, so they mix with each other at boundaries.

b. oceanic plates are made of dense rock; therefore they sink into the asthenosphere more readily. continental plates are made of lighter, more buoyant rock.

c. oceanic plates are made of less dense rock; therefore they rise into the asthenosphere more readily. continental plates are made of denser rock.

d. oceanic plates are made of very dense rock; therefore they rise into asthenosphere more readily. continental plates are made of dense rock so they rise too.

Juan and carol were studying invertebrates in biology. they knew that segmented or earth worms preferred a dark, moist habitat. during this lab, they would be investigating the responses of organisms called planaria or dugesia tigrina. these were simple flatworms that still had a one-way digestive system and a very simple nervous system. juan and carol placed the planaria in a petri dish containing cool, distilled water that was partially covered with black paper. they shined a light on the dish. next, they removed the paper and placed a small amount of chicken liver at one end of the dish. they added a few large salt crystals to the water. finally, they added drops of hot water to the cool water in the petri dish. their results can be seen in the data table. according to their experiment, all but one conclusion is valid.