The layer of the atmosphere closest to the Earth, where 'weather' occurs is the:

The angle at which sunlight strikes the Earth's surface is called the angle of:

Normal air pressure is greatest at:

The most abundant gas in the atmosphere is:

Air pressure is measured by an instrument called a:

The main energy source for the Earth is the:

Water vapor gets into the air through a process called:

Water vapor is water in the form of:

The amount of water vapor in the air is called:

Which air can take on more water vapor?

The changing of gas into a liquid occurs in a process called:

Check the items below that are required for clouds to form:

Clouds that are puffy in shape and appear to rise up from a flat bottom are:

A cloud is made up of: (check all that apply)

Most of the liquid that turns into water vapor comes from:

A cloud a ground level is called:

___________ occurs when cloud droplets or ice crystals join together and become heavy enough to fall to the ground.

Select the forms of precipitation:

The comparison of how much water vapor is in the air and the maximum amount of water vapor the air could hold at a given temperature is called:

Differences in air pressure on the Earth's surface cause:

When an air mass becomes humid, the air pressure under that air mass:

Water vapor molecules weigh _____________ than oxygen or nitrogen molecules.

Air that moves horizontally across the Earth's surface is called:

A wind that blows from the sea toward the land is called a:

If you observe winds blowing from the North pole as they head southward, the winds seem to curve to the right. This turning of the winds is know as the:

Select the factors that can directly affect the air pressure of an air mass:

A high wispy cloud made of ice crystals is a:

Isobars indicate constant:

On a hot, humid day, we feel warmer because the moisture on our skin evaporates ______________.

The temperature of the oceans change _____________ than the land masses near them.