1. Which of the following demonstrates an airplane converting kinetic to potential energy? A. It ascends to a higher altitude.
B. More passengers board the plane.
C. It moves downward to make a landing.
D. The wheels spin as it moves on the ground.

igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods

the answer you are looking for is d. there are no holes for blood to enter or leave the system. your welcome