Know About Submarine

A submarine has tanks inside. These are filled with water to make the sub sink. To make the sub rise, the tanks are emptied, making the sub lighter.Submarines have been used since the 18th century, but the first practical submarine was not Built until just prior to World war I. Today most submarines are in military service, but future plans call for the use of submarine oil tankers. Submarines submerge and surface by filling or emptying their sea water tanks, but they also control their depth with a horizontal rudder.

Phone From a Car

No one really knows if dinosaurs had voices. Maybe some did and others didn't. Hadrosaurs had a hollow in their head crest, and they may have trumpeted sounds through it almost the way an elephant uses its trunk. Sound leaves no visible record and so the question of whether dinosaurs could communicate may be the most difficult question of all. However, there is fossil evidence to show that the nostrils of Hadrosaurs were elongated. The hollow in the head crest might have acted as a kind of echo chamber; a noise formed in the throat trumpeted through the crest for identification of species, communication, mating and warnings. Parasaurolophus, or the archetypal Hadrosaaurus, was named the trombone duckbill because of its facial structure.

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