14 résultats pour "diving"

• Diving (underwater).

  compensator (or control) device (BCD or BC), which the diver wears as a vest. By adding air to the BCD, the diver becomes more buoyant and rises. By releasing air,the diver becomes less buoyant and sinks. With minor adjustments of air, the diver can achieve neutral buoyancy. A third hose attaches to pressure gauges that diversuse to monitor how much air remains in the tank. A fourth hose attaches to a backup breathing device called an alternate air source, or octopus. Divers also wear a belt w...

• Diving (sport).

  water that creates a larger, more noticeable splash after the diver’s body displaces water under the surface. To minimize this upjet, top-level divers make a quickswimming motion by releasing their hands and collapsing their arms as they submerge. Instead of a large splash, the surface of the water appears to boil as the airbubbles rise from the diver’s entry. For feetfirst entries, which are rare in top-level competitions, divers place their legs and feet together while pointing their toes down...

• Women's Diving: Olympic Gold Medalists.

• Men's Diving: Olympic Gold Medalists.

• Men's Diving: Olympic Gold Medalists.

• Snorkeling.

  injury from animals is to be aware of diving conditions at a site, to dive with a buddy, and to leave the water promptly should a problem occur. Boaters can also pose a serious threat to snorkelers. If not near a boat or a visible dive flag, snorkelers can be virtually invisible to boaters and can be run over.Another common danger in snorkeling is fatigue, which can lead to drowning. V WORKING UNDERWATER Most underwater work is accomplished by scuba divers because they can remain underwater at...

• International Women's Sports Hall of Fame.

  Kringstad, Annichen Orienteering Contemporary 1995 Ladewig, Marion Bowling Pioneer 1984 Latynina, Larissa Gymnastics Pioneer 1985 Lawrence, Andrea Mead Skiing Pioneer 1983 Lenglen, Suzanne Tennis Pioneer 1984 Mann, Carol Golf Contemporary 1982 Marvignt, Marie Aviation; Mountaineering Pioneer 1987 McCormick, Pat Diving Pioneer 1984 McKay, Heather Racquetball; Squash Pioneer 2003 Meagher, Mary T. Swimming Contemporary 1993 Meyer-Reyes, Debbie Swimming Contemporary 1987 Meyers, Ann Basketball Conte...

• International Women's Sports Hall of Fame.

  Kringstad, Annichen Orienteering Contemporary 1995 Ladewig, Marion Bowling Pioneer 1984 Latynina, Larissa Gymnastics Pioneer 1985 Lawrence, Andrea Mead Skiing Pioneer 1983 Lenglen, Suzanne Tennis Pioneer 1984 Mann, Carol Golf Contemporary 1982 Marvignt, Marie Aviation; Mountaineering Pioneer 1987 McCormick, Pat Diving Pioneer 1984 McKay, Heather Racquetball; Squash Pioneer 2003 Meagher, Mary T. Swimming Contemporary 1993 Meyer-Reyes, Debbie Swimming Contemporary 1987 Meyers, Ann Basketball Conte...

• Whale - biology.

  III BEHAVIOR OF WHALES Studies of whales in captivity have taught scientists much about the complex social behavior of whales. Since the late 1980s, advances in the use of satellite trackingsystems have also broadened opportunities for scientists to observe how whales behave in the wild. A Swimming and Diving Whales swim by making powerful up-and-down movements of the tail flukes, which provide thrust. The power comes from body muscles that flex the lower spine upand down in a wavelike motion...

• Duck - biology.

  from water. When ducks feed they push their tongue against the top of their mouth to squeeze water through the lamellae, leaving the food behind. Mergansers arefish-eating ducks with slender bills that are notched on the edges like the blade of a saw. These saw-toothed beaks help the ducks catch and hold their slippery prey. VI COURTSHIP AND REPRODUCTION Ducks form pairs long enough to mate, but most species find new mates each year. In a few species, including buffleheads and whistling ducks,...

• Bird. I INTRODUCTION Bird, animal with feathers and wings. Birds are the only

  B Physical Adaptations for Flight The internal body parts of all birds, including flightless ones, reflect the evolution of birds as flying creatures. Birds have lightweight skeletons in which many of themajor bones are hollow. A unique feature of birds is the furculum, or wishbone, which is comparable to the collarbones of humans, although in birds the left and rightportions are fused together. The furculum absorbs the shock of wing motion and acts as a spring to help birds breathe while they...

• Bird - biology.

  B Physical Adaptations for Flight The internal body parts of all birds, including flightless ones, reflect the evolution of birds as flying creatures. Birds have lightweight skeletons in which many of themajor bones are hollow. A unique feature of birds is the furculum, or wishbone, which is comparable to the collarbones of humans, although in birds the left and rightportions are fused together. The furculum absorbs the shock of wing motion and acts as a spring to help birds breathe while they...

• Submarine.

  B Propulsion Modern submarines use either diesel-electric or nuclear power to drive the sub's propeller and to provide internal electric power. Diesel-electric power emerged as themost efficient propulsion system for submarines in the early 20th century, following unsuccessful attempts to use steam or gasoline power. While on the surface, thesubmarine uses a diesel engine to drive the propeller and generate electricity. When submerged, a battery-driven electrical motor takes over for propulsion...

• Dominica - country.

  Other crops are being promoted to diversify the economy away from reliance on bananas. They include coffee, cacao, mangoes, citrus fruit, and root vegetables. Pumice is quarried and exported on Dominica. Manufacturing is on a small scale and largely limited to the processing of farm products. The main manufactured goodsare fruit juices, alcoholic beverages, soap, and essential oils. The island also has electronic assembly plants, data-processing companies, and garment manufacturers. The governme...