Hammerhead Shark
The nine known species of hammerhead range from 0.9 to 6 m long (3 to 20 feet). All the species have a projection on each side of the head that gives it a resemblance to a flattened hammer. The shark`s eyes and nostrils are at the tips of the extensions. The hammer shape of the head was once thought to act as a wing, aiding in close-quarters maneuverability and allowing the shark to execute sharp turns without loss of stability. However, it was found that the special design of its vertebra allow...
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Nitrogen Narcosis Effects
Effects Along with the bends, which is a risk during the ascent of a dive, narcosis is one of the most dangerous conditions to affect the scuba diver at depth. The most dangerous aspect of narcosis is the loss of decision-making ability, loss of focus, and impaired judgment, multi tasking and coordination. At its most benign, nitrogen narcosis results in relief of anxiety and a feeling of tranquility and mastery of the environment. These effects are similar to both alcohol and familiar benzodiaz...
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Facts about Sharks
1. Great white sharks grow about 10 inches per year. Great whites can grow to mature lengths of 12 to 14 feet. 2. New teeth are constantly being formed in rows in a shark`s jaw. Shark`s teeth are normally replaced every eight days. 3.Some species of sharks can shed as many as 30,000 teeth in their lifetime. 4. Whale sharks have approximately 300 rows of teeth, with hundreds of tiny teeth in each row. 5. Dried shark skin (shagreen) was used in the past as sandpaper. In Germany and Japan, shark sk...
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