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This work has been released into the public domain by its author, ''singlecell'.This applies worldwide. In some countries this may not be legally possible; if so: singlecell' grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.
Sea butterfly pseudoconch The group is known within the fossil record from shells of those groups within the clade that mineralized. [ 12 ] [ 13 ] These carbonate shells are a major contributor to the oceanic carbon cycle, making up as much as 12% of global carbonate flux. [ 3 ]
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Scuba diving is a mode of underwater diving whereby divers use breathing equipment that is completely independent of a surface breathing gas supply, and therefore has a limited but variable endurance. [1] The word scuba is an acronym for "Self-Contained Underwater Breathing Apparatus" and was coined by Christian J. Lambertsen in a patent ...
The butterfly was sometimes depicted with the maw of a jaguar, and some species were considered to be the reincarnations of the souls of dead warriors. The close association of butterflies with fire and warfare persisted into the Aztec civilisation; evidence of similar jaguar-butterfly images has been found among the Zapotec and Maya civilisations.
Underwater images are magnified by 25 percent, and the dome will correct for that. The technique requires a small f/stop—f/16 or smaller—for great depth of field, plus a lens capable of close-focus; you always focus on the subject below the water line. You also have to balance the light.
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Illustration of an occupied diving bell.. The diving bell is one of the earliest types of equipment for underwater work and exploration. [10] Its use was first described by Aristotle in the 4th century BC: "...they enable the divers to respire equally well by letting down a cauldron, for this does not fill with water, but retains the air, for it is forced straight down into the water."