Because the Earth's outer layers of Earth, there is not flat at the top crust to look like a rock when the heat radiated from the Earth's core made of petrified liquid viscosity, called magma (magma under the sheets. The crust is called magma when it is pushed into the earth's atmosphere is called lava), and when the heat from the core of the world, it will circulate like the water in a kettle of hot water. Running around with a pot smoke pouring out of the volcanic vent, too, and eventually rose to spill out of the crevices of the plates.
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