A high-altitude cloud with a featherlike shape, made of ice crystals.
What are cirrus clouds?
100
A boundary between air masses where the warm air mass slides up and over the cold air mass.
What is a warm front?
100
This tool measures air temperature.
What is a thermometer?
100
A large region of the atmosphere where the air has similar properties throughout.
What are air masses?
100
A blank circle is used to symbolize this type of cloud cover.
What is clear?
200
This is a map that shows weather conditions at a certain time and place. It shows the locations of fronts, wind direction, and temperature and air pressure measurements.
What is a weather map?
200
An unmoving front where a cold air mass and a warm air mass meet. There may be rain for many days.
What is a stationary front?
200
This tool measures air pressure.
What is a barometer?
200
The blanket of gases that surrounds Earth.
What is the atmosphere?
200
A completely filled in circle is used to symbolize this type of cloud cover.
What is an overcast?
300
This is the daily condition of the atmosphere.
What is weather?
300
The average weather in a certain place for a long period of time.
What is climate?
300
This tool measures wind direction.
What is a weather vane?
300
A measurement of how much water vapor is in the air.
What is humidity?
300
A circle that is half-colored in symbolizes this type of cloud cover.
What is partly cloudy?
400
A puffy cloud that appears to rise up from a flat bottom.
What are cumulus clouds?
400
A large area with a similar climate. The United States have seven.
What is a climate zone?
400
This tool measures wind speed.
What is an anemometer?
400
The force put on a given area by the weight of the air above it.
What is air pressure?
400
A circle that has only one quarter colored in symbolizes this type of cloud cover.
What is scattered clouds?
500
A cloud that forms in a blanket-like layer.
What are stratus clouds?
500
A front where cold air moves in under a warm air mass.
What is a cold front?
500
This tool measures humidity.
What is a hygrometer?
500
Air is mostly made up of these two gases.
What is nitrogen and oxygen?
500
A circle that is three-quarters colored in symbolizes this type of cloud cover.