Before a chemical reaction can start, must be absorbed by the reactants. the amount that must be absorbed to start the reaction is called the

its like this, "if i give a plant an unlimited amount of sunlight,then the plant will grow to its largest possible size."

hope it let me know if it does or doesn't =^-^=

it cools slower in the earth meaning the crystals have more time to form than lava on the surface

b. lithosphere, asthenosphere, mesosphere   is the answer most likely