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.
pressure at any given height is called an air mass. A single air mass may spread over millions of square kilometers and be up to 10 kilometers deep. Types of Air Masses Scientists classify air masses according to two characteristics: temperature and humidity. Four major types of air masses influence the weather in North America: maritime tropical, continental tropical, maritime polar, and continental polar. The characteristics of an air mass depend on the temperatures and moisture content of the region over which the air mass forms. Remember that temperature affects air pressure. Cold, dense air has