11. the process by which one or more substances change to produce one or more different substances

Nuclear fusion is the source of energy for stars. besides hydrogen, which other element is most likely also common in stars?

What energy is it when you flip on a switch on a lamp

Which answer tells the reason the earth’s climate is getting warmer? too many animals are becoming extinct. large glaciers are melting in antarctica. the earth is moving closer to the sun. driving cars gives off gases that trap heat in the atmosphere.