Share: Cervical dystonia (say: serv-ical dis-tone-ee-a) is a condition in which the muscles in the neck contract, twisting the head to one side and pulling the chin to the shoulder.Sometimes the shoulder on the affected side will also be pulled up toward the head.hare: Cervical dystonia (say: serv-ical dis-tone-ee-a) is a condition in which the muscles in the neck contract, twisting the head to one side and pulling the chin to the shoulder.
How do scientist classify air masses? Scientists classify air masses according to their general characteristics and latitude. Artic air masses form at around 60 degrees latitude, Polar masses are at around 40 â¦ degrees latitude, warm tropical air masses are at 15 degrees latitude and very hot air masses form near the equator.
Air masses build over source regions that have relatively similar ground surface characteristics. Air masses that build over the land are called continental air masses while air masses that build over the open ocean are called maritime air masses. Air masses cover 100 s to 1000 s of kilometers of distance. What causes these huge regions of air to move? Air masses build when the air stagnates over a region for several days/weeks. To move these huge regions of air, the weather pattern needs to change to allow the air mass to move. One major influence of air mass movement is the upper level winds such as the upper level winds associated with the jet stream.