a football coach paces back and forth along the sidline during a close rivalry game. the diagram below shows several of the coaches positions at various times. at eachmarked position, the coach turns and moves in the oppisite direction in other words, the coach moves from position A to B to C to D.

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

conservation of mass

mass before something happens = mass afterwards