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.
Wind is another force that causes ocean currents. Uneven heating by the sun creates winds which blow across the water's surface. The Earth's spin also creates winds that blow across the ocean. Trade winds are located near the equator, while the Westerlies blow in the middle latitudes.