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.
This movement of air is what makes the wind blow.Ocean waves are caused by the wind, which is caused by the sun (see above). The energy of the wind passes over the wave and due to friction it brings the water up with it. Once the wind has passed over or can no longer hold the water up, it drops the water.