First the ice caps didn't melt that much and freeze again within 6,000 years and the land wasn't lower 6,000 years ago because science and observation. Don't make a remark if you have no idea what the -blam!- you're talking about.
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And observation by people who were there 6000 years ago? I mean land masses have popped up over a few days and have disappeared just as fast you guys claim to have an understanding of how the universe works but we haven't even scratched the surface cataclysmic events transpired at some point to cause a mass extinction and form the polar ice caps
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Don't know where you get your facts but land masses take hundreds of thousands of years to be created.