atrial fibrillation. n. Abbr. AF. Fibrillation in which the normal rhythmical contractions of the cardiac atria are replaced by rapid irregular twitchings of the muscular wall that cause the ventricles to respond irregularly. Also called a-fib, auricular fibrillation.
continental=on land. here is a good example of plate tectonics, i just had to explain all that stuff. Subduction is when converging plates come together. they make a trench by one plate sliding under the other and into the mantle.
How does the movement of tectonic plates occur? The layer of the Earth called the mantle is continuously circulating like rice would in boiling water. This movement under the crust cause the plates to shift moving the plate â¦ s to create mountains, valleys, earthquakes, and tsunamis..