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THE RESTLESS EARTH The earth is approximately 4.5 billion years old. About 4.2 billion years ago the atmosphere was thick with water and rain began to fall for the first time. The surface of the earth is constantly moving. The continents change position and collide causing catastrophic volcanic eruptions and devastating earthquakes, and rises and falls of sea levels. The oldest evidence of life on earth is 3.5 billion years ago. This date came from stromatolites that still exist in Western Australia. Stromatolites
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