The sentence explaining "purple" does not make sense:<p>> For instance, should levels of sulfur increase, the oceans may appear purple due to intense volcanic activity and low oxygen in the atmosphere.<p>Increased levels of sulfur causing volcanic activity? Michael Crichton's words come to mind:<p>> I call these the "wet streets cause rain" stories. Paper's full of them.
well we actually would have wine dark seas then.<p>(<a href="https://en.wikipedia.org/wiki/Wine-dark_sea" rel="nofollow">https://en.wikipedia.org/wiki/Wine-dark_sea</a>)