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 primarily two kinds of currents caused by three major forces. First the uneven heating of water causes a vertical lift and underflow of water causing a vertical loop â¦ . Secondly the circular flow around the oceans is caused by the Coriolis effect of the Earth's rotation.