To understand the scientific theory of the Earth's creation, first we must define the Big Bang. The Big Bang Theory is the theory that the universe started from a single point, and has been expanding ever since. Scientists believe that the expansion began from a cosmic explosion, but have not identified the cause of the explosion. The movement of the universe has been verified by observations, such as the apparent movement of galaxies away from us, and the cosmic microwave background radiation believed to be the leftover light from the big bang.
Dust and gas left over from the explosion is what led to the creation of planets. Molten lava fused together into a spherical shaped object, the outer layer of which eventually cooled. Volcanic activity produced gas which created an atmosphere. The existence of the atmosphere allowed for condensation of the water vapor, which eventually led to the surface becoming all water. Over time, the land mass has risen above the surface of the water.
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