EGD or Upper Endoscopy Procedure. The device used during an EGD procedure is called a flexible endoscope. It is tubular in shape and is very similar to the colonoscope that gastroenterologists use to examine a patientâs colon during a colonoscopy procedure, just thinner in diameter.
What causes ocean currents? Ocean currents result from two processes - the action of wind on the surface of the water, and from variation in water temperature that causes movement- a process known as convection. Convection occurs because the oceanic waters heat up becoming less dense.
The following factors cause ocean currents: (a) The prevailing winds are the major cause of the ocean waters moving in a definite direction. The pushing action of these winds makes the waters flow as they do. Like the planetary winds, currents too are deflected from their original path due to the rotation of the Earth.