In the rock cycle, igneous, metamorphic, and sedimentary rocks can all become
magma again. What step in the rock
cycle causes this to happen?
A. heat and pressure
B. cooling
C. melting

< > according to newton's third law of motion, forces always act in equal but opposite pairs. another way of saying this is for every action, there is an equal but opposite reaction.< >

nuclear fission produces elements that are heavier than helium.

the elements that are used in nuclear fission and their products are much heavier than helium.