The Atmosphere Around You
Water in the Atmosphere
Air Masses
Predicting Weather Changes
Severe Weather and Floods
100
This gas makes up about 78% of Earth's atmosphere.
What is nitrogen?
100
This process changes liquid water into water vapor.
What is evaporation?
100
When cold and warm air masses meet and neither advances, this kind of front forms.
What is a stationary front?
100
A drop in air pressure usually indicates this type of weather.
What is stormy weather?
100
A strong tropical cyclone that occurs in the Atlantic Ocean or northeastern Pacific Ocean.
What is a hurricane?
200
Air always moves from areas of high pressure to areas of this.
What is low pressure?
200
This temperature marks the point at which water vapor begins to condense into liquid.
What is the dew point?
200
This type of air mass is warm and humid.
What is maritime tropical?
200
These lines on a weather map connect points with equal air pressure.
What are isobars?
200
A storm with freezing precipitation, strong winds, and low temperatures is this.
What is a winter storm (blizzard)?
300
This instrument is used to measure air pressure.
What is a barometer?
300
A digital hygrometer is used to measure this.
What is humidity?
300
This low-pressure system rotates counterclockwise in the Northern Hemisphere.
What is a cyclone?
300
Symbols on a weather map showing triangles or semicircles indicate these.
What are fronts?
300
A funnel-shaped cloud that touches Earth’s surface is this type of storm.
What is a tornado?
400
These three methods describe how heat moves through Earth’s atmosphere.
What are convection, conduction, and radiation?
400
The driving force behind evaporation and condensation is this form of energy.
What is solar energy?
400
A slow-moving warm air mass overtaking a cold one produces steady rain and clouds for days. What is this front?
What is a warm front?
400
An "H" on a weather map represents this.
What is a high-pressure area?
400
The main energy source for hurricanes is this.
What is warm ocean water?
500
This layer is where almost all weather occurs.
What is the troposphere?
500
When water vapor condenses near ground level, it forms this.
What is fog?
500
This phenomenon causes winds to curve to the right in the Northern Hemisphere.
What is the Coriolis effect?
500
Weather conditions in Florida
What is rain and thunderstorms?
500
When severe weather is approaching and people should take shelter, this alert is issued.
What is a "warning"?