What is the general relationship between altitude and air temperature as described for Earth's atmosphere?

As altitude increases, air temperature also increases.

As altitude increases, air temperature decreases.

Altitude has no predictable effect on air temperature.

As altitude increases, air temperature stays constant.

A hiker starts a climb at the base of a tall mountain where it is 75°F (24°C). What should the hiker expect the temperature to be like at the summit?

Significantly warmer than 75°F

Significantly colder than 75°F

The temperature will fluctuate unpredictably

They would have the same climate.

A steady increase in temperature.

A relatively constant temperature.

A steady decrease in temperature.

A random and unpredictable change in temperature.

Mountain peaks are always in the shade.

The air at high altitudes is cold enough to keep snow from melting.

It snows more on mountains in the summer than in the winter.

The sun's rays are reflected away by the mountain's slope.