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Aerial images also have trouble distinguishing between seagrass and other green underwater blobs, such as macroalgae.

As a planet cools from its surface downward, cold and denser material sinks, while blobs of hotter fluid rise like boiling water -- a process called convection.

Australian scientists have solved a mystery which has gripped Sydney: what were the sticky dark blobs which washed up on some of the city's famed beaches last month?

So far, they have grown tiny blobs of skin, out of which have sprouted little hairs.

White blobs have been washing up on the beaches of Newfoundland recently, sparking an investigation by Canadian officials.