Variables: air temp moisture content air pressure. Creates low pressure air coming off earth surface. Goes up into atmosphere rises cools causes condensation leads to rain. Atmosphere at low altitude = high pressure. 30 degrees s or north earth"s surface cool dry or descending at high pressure on earth"s surface. Between 30 degrees south and equator and 30 degrees north and equator gaining heat and moisture, air is deflected by cordials effect. Any object whos temp is absolute zero or equal to and contains some heat this is always being radiated away from object. Unequal raditatio on surface of the globe. Unequal radiation on surface is further compounded by unequal absorption and reflection. Albedo : percentage of incoming radiation that is reflected rather then absorbed. High incident angle less then 5 % reflected water. Feedback: response of system or component of system to proves of the system itself. Good example has to do with albedo.