A huge body of air that has similar temperature, humidity, and air. pressure at any given height is called an. air mass. Scientists classify air. masses according to temperature and humidity. Four major types of air. masses inï¬uence the weather in North America: maritime tropical, continental tropical, maritime polar, and continental polar. Tropical, or. warm, air masses form in the tropics and have low air pressure.
It employed 28,490 RNs in May 2013 (as per the BLS). At that time, employment per 1,000 jobs for these professionals was 17.366. According to the survey of the Bureau of Labor Statistics, the average annual and per hour registered nurse salary in Oregon was $80,440 and $38.67, respectively, in May 2013.
The average salary of a licensed practical and licensed vocational nurse working in San Francisco is $62,330.n 2013, registered nurses had an average salary of $68,910, and nurse practitioners had an average salary of $95,070. However, some nursing positions earn less, including nursing aides, who made $26,020, and medical assistants, who took home $30,780 in 2013.