Actually, before there was life on land there was life in the ocean. Life in the ocean began about 3.1 to 3.4 billion years ago. Life on land began only 400 million years ago.
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that you find have spent a considerable amount of time floating in the ocean. It has been tumbling along the sand and water for so long that that the glass, slate or what have you, has been polished by the sand grains.






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