Q1. what causes the most difference in the air pressure? #1. differences in elevation #2. differential heating #4. windsq 2. when is air pressure highest #1. when air is moving sideways #2. when air is sinking #3. when air is rising q 3. air pressure is measured in witch #1. degrees #2. millibars #3. isotherms#4. isolinesq 4. what pressure pattern is often associated whith clouds or rain #1. low temperatures #2. high temperatures #3. high pressure #4. low pressure