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.
There are two types of ocean currents: surface currents and deep water currents. Primary forces such as solar heating and winds start ocean currents. Secondary forces, including gravity and the Coriolis force, direct where the current goes. These are some of the facts about ocean currents.