The sinking of ocean crust back into the mantle when it meets continental crust is (convergent / sea-floor spreading / divergent boundaries / subduction), and this occurs at (ocean trenches / mid-ocean ridges / plate centers / mountain ranges).

Which of the following is the correct definition of chemical energy? a. energy an object has because of its motion or position b. energy resulting from the flow of charged particles, such as electrons or ions c. energy produced from the splitting of atoms d. energy stored in chemical bonds of molecules