What is the pressure that a column of air exerts on the air or surface below it?
A: dew point
B: humidity
C: pressure
D: weather

[ou.01jthe greatest speed with which any physical object moves is 300,000 km/soundsec. which of the following has a speed of 300,000 km/sec? a.light in water b.light in vacuum c.sound in air. d. sound in water

Given: circle a externally tangent to circle b. how many possible common tangents to circles a and b can exist? 2 3 4

Which part of a mountain receives the majority of moisture due to the rain shadow effect? a. the leeward side b. the windward side c. the bottom of the mountain d. all parts of the mountain receive equal amounts of moisture.