<span>Water is never added to earth system. Water forever remains in the water cycle on earth, so it goes from the ground, to the air, to the rain, to the sea, and round and round continuously. This cycle means that there does not need to be new water added to the earth, because it recycles any water that already exists of its own accord.</span>
Hot, soft rock rise from the bottom of the mantle towards the top, cools, and sinks back through the mantle.
red goes to red, black goes to white, yellow goes to green, blue goes to blue.