Why are winters in San Francisco more mild than winters in Kansas? Select one: a. San Francisco is next to the ocean, and the heat stored in the water keeps the air from getting very cold. b. San Francisco is farther north, so they get more sun during the winter. c. San Francisco is on a series of tall hills, and it's warmer as you climb. You are at an airport at 3000 ft. elevation. The sea-level pressure is 29.92" Hg. The temperature is 3°C. What is the density altitude? Select one: 

a. Higher than 3,000 ft 

b. 3,000 ft 

c. Lower than 3,000 ft