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100
Air that surrounds our planet
atmosphere
100
Air particles pressing down on a surface
air pressure
100
Layer of the atmosphere that is closest to Earth
troposphere
100
Layer of the atmosphere just above most weather
stratosphere
200
Heat from the sun is trapped in the atmosphere to warm the Earth
greenhouse effect
200
Border formed where a cold air mass and a warm air mass meet
front
200
Large body of air that has moisture content and temperature similar to the water or land it is formed over
air mass
200
Instrument that measures air pressure
barometer
300
Instrument that measures wind speed
anemometer
300
Amount of water vapor in the air
humidity
300
How many layers are in Earth's atmosphere
Four
300
In what layer of the atmosphere does most weather occur
troposphere
400
What are the layers that make up Earth's atmosphere
thermosphere, stratosphere, mesosphere, troposphere
400
What two properties can be used to describe air masses
temperature and moisture
400
A _____ front forms when two air masses meet and don't move.
stationary
500
What is a characteristic of warm air
it is forced up by cool air or it exerts low pressure
500
As you get highest in the atmosphere, the space between air particles
increases
500
Energy from the ____ is trapped by gasses in the air, causing the greenhouse effect.
sun
500
An air mass that forms over tropical waters would be
warm and moist