Lakes can 'turn over' seasonally — water layers of different temperatures and densities mix, bringing nutrients to the surface.
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The Mariana Trench is so deep that Mount Everest could be placed inside it and still be covered by over a mile of water.
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There is more water in Earth's mantle than in all the oceans on the surface.
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Sea turtles can migrate thousands of miles between feeding and nesting areas.
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Octopuses have been observed using tools and solving puzzles.
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The Arctic fox changes fur color with the seasons.
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Octopuses solve mazes.
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