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.
As these currents mix the oceans surface and deep waters, they help replenish the oxygen in the water. Other Causes of Currents. Other causes of currents include tides, rain, runoff, and ocean bottom topography. Topography is the surface features of a place.urface ocean currents are mainly caused by wind. The winds that most affect the oceans' currents are: The Role of Density. Differences in water density affect vertical ocean currents (movement of surface ocean water to the bottom of the ocean and movement of deep ocean water to the surface).