GEOG 2050 Lecture : Geog Notes 1 26
Document Summary
Vernal equinox- first day of spring (march 21st) Air- simple mixture of gases the is naturally odorless, colorless,tasteless, and formless, blended so thoroughly that it behaves as a single gas. For practicality: top of our atmosphere is 480 km (300 miles) above earth"s surface. Beyond this is the exosphere- outer sphere:- less dense atmosphere is nearly a vacuum. Weakly bounded by gravity as far as 32,000 km from earth. 4 main layers tropshere (upper level: tropopause) temperature: stratosphere (upper level: stratopause) Earth"s atmosphere exerts its weight, pressing downward due to gravity. Air molecules create air pressure through motion, size, and number. Pressure is exerted on all surfaces in contact with air. The weight (or force) of the atmosphere, or air pressure, pushes in on all of us. Because we have internal air that pushes out and equalizes it. Decreases with height due to the effect of gravity. *warm air is less dense than cold air.
