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.
An air mass is a large body of air that has relatively uniform temperature and humidity characteristics. The regions where air masses form are referred to as air mass source regions.If air remains over a source region long enough, it will acquire the properties of the surface below.n air mass is a large body of air that has relatively uniform temperature and humidity characteristics. The regions where air masses form are referred to as air mass source regions.