RM
Worm mound
Worm mound. Mound built up by an unidentified aquatic worm in the sandy sea floor of the La Ciotat cave off the coast of France. This cave, although only 25 metres below sea level at its deepest point, has a unique ecosystem. Due to its constant temperature, total darkness and small amount of water movement, it is inhabited by creatures usually only found in the abyssal ocean. This allows marine biologists to study creatures that would normally be too deep to examine for any length of time, if at all.
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