Can you name the biggest water forms on Earth? The largest oceans, seas, gulfs and lakes are here! They are beautiful and vast, but deep and deadly. Rich with marine lifeforms, over 400,000 species are known today and theoretically over a million more await discovery. It is estimated that the world's entire ocean-based economy supports livelihood for 3 billion people and a staggering USD 3-6 trillion/year! Test your knowledge in this geography puzzle.
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