What is the bottom of the Clear Lake?

With over 400 feet of sediment on its bottom, Clear Lake acts as nature's time capsule, providing scientists a look back into millions of years of history. This information is useful for a number of purposes, including understanding how the Earth responds to climate change and how human impacts affect lakes over time.



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Italy's Lugano and Maggiore were the most polluted in an international survey of 38 lakes.

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