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Earth is the largest of the inner planets and was created like all the remaining planets in the Solar System, approximately 4.6 billion years ago. The early Earth was formed by the collision and fusion of smaller rock fragments, the so-called planetesimals.
Studies of ancient rock fossils reveal that life probably began about 4 billion years ago, when the Earth was very young. Nobody knows how life began on our planet. Most scientists think it originated in liquid water.
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