back and decrease.

veer and decrease.

back and increase.

veer and increase.

Stratocumulus, altostratus, cirrus.

Cirrocumulus, altostratus, stratocumulus.

Cirrostratus, altostratus, stratus.

Cirrocumulus, altocumulus, cumulus.

Cloud cover has NO effect on the amount of the Sun's radiated heat arriving at the Earth's surface.

The Earth only radiates heat into space between sunset and sunrise.

The Earth is heated by short-wave radiation from the Sun, but cooled by its own long-wave radiation into space.

The Earth is heated by long-wave radiation from the Sun, but cooled by its own short-wave radiation into space.

clouds containing only ice crystals.

cirro-type clouds.

convective clouds.

stratified clouds.

Clear skies at night over an inland marshy area

A mild moist airstream flowing over colder surfaces with a wind in excess of 30 kt

Cold maritime air flowing over a warmer land surface at a speed greater than 15 kt

A mild moist airstream flowing over colder surfaces with the wind speed less than 15 kt

The saturated water vapor content increases as precipitation takes place when the temperature drops.

The actual water vapor content decreases to remain equal to the saturated water vapor content.

The saturated water vapor content remains constant as the air is at 100% relative humidity.

The actual water vapor content increases to remain equal to the saturated water vapor content.

Cirrostratus

 stratus

Nimbostratus

Altostratus

As pressure decreases the true altitude decreases.

As pressure increases the true altitude decreases.

At a constant flight level, variations in pressure do NOT affect the true altitude.

As pressure decreases the flight level will increase and true altitude will increase.

50% oxygen, 40% nitrogen, and the rest other gases.

10% oxygen, 89% nitrogen, and the rest other gases.

21% oxygen, 78% nitrogen, and the rest other gases.

88% oxygen, 9% nitrogen, and the rest other gases.

FL 100

FL 390

FL 180

FL 160