To burn a piece of paper, why must the paper touch the flame? the products contain more energy than the reactants. the flame provides energy for bond formation in the piece of paper. the flame provides the energy needed to start breaking bonds in the paper.

Rocks, as they are compressed, begin forming mountains above the earth's surface when two continental plates converge. the continental crust increases in depth as the mountains grow above. the himalayan mountains formed at a convergent plate boundary in this manner. the rocks are smashed together causing them to due to the intense heat and pressure from the colliding plates and eventually forming rock. a) melt; igneous b) layer; sedimentary c) recrystallize; metamorphic d) melt into the earth's interior; metamorphic