a thin partition divides a thermally insulated vessel into a lower compartment of volume v and an upper compartment of volume 2v. the lower compartment contains n moles of an ideal gas; the upper part is evacuated.

thermal energy is the answer

the answer is b, have negligible mass

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

a skateboard rolling across the street - apex