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. The air masses in and around North America include the continental arctic (cA), maritime polar (mP), maritime tropical (mT), continental tropical (cT), and continental polar (cP) air masses. Credit: NOAA. Air is not the same everywhere.In North America, for example, cold and dry air covering thousands of miles flows south from the Arctic, especially in winter, and warm moist air flows south from the Gulf of Mexico.These different types air are called air masses.he word that describes humidity (maritime or continental) is paired with the word that describes temperature (equatorial, tropical, polar or arctic). For example, if an air mass forms over a tropical ocean, it is called maritime tropical.