2. The density in the mine would be greater. There is more atmosphere pushing down the further down into the earth one travels.

3. Air pressure decreases as one increases in altitude. Time is required for the body to adjust to the new outside pressure, in the mean time, the pressure pushing out of your body is greater than the pressure pushing in. A popping sensation is the result of a sudden adjustment.

4. Initially the smoke is warmer (less dense) than the air around it, hence it rises. The smoke continues to rise until it reaches a point where it has the same temperature as the atmosphere, then it begins to spread out.

7. In January the northern hemisphere is tilted away from the sun, so it receives less solar radiation per unit area.

8. Higher temperatures produce shorter wavelengths. Solar radiation is therefore composed of shorter wavelengths than terrestrial radiation.

11. The higher in the atmosphere you travel, the less solar radiation is blocked. So the higher you go, the more solar (UV) radiation you receive.

13. Yes. When an air mass expands (or contracts) its temperature goes down (or up) even though no thermal energy was added (or subtracted).

15. No. Ozone created by automobile exhaust is quickly (a day or so) turned into other gasses before it reaches the stratosphere, let alone the south pole.

16. Air currents flow from high to low. As air moves from high to low pressure it expands and cools, which causes and existing moisture to condense into clouds.

17. Weather is more predictable. Weather refers to daily conditions while climate refers to long term conditions. The further ahead we try to predict the less accurate we are due to all the variables that work within the atmosphere.

19. Moisture from the warm ocean provides the reservoir of energy. When the moisture condenses, it releases heat, which provides energy that the hurricane releases. Once the hurricane moves over land it loses its energy source.