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27 Cards in this Set

  • Front
  • Back
What is weather?
the condition of Earth's atmosphere at a particular time and place
What is the atmosphere?
the envelope of gases that surrounds the planet
What is Earth's atmosphere made up of?
nitrogen, oxygen, carbon dioxide, water vapor, and many other gasses as well as particles of liquids and solids
What is the most abundant gas in the atmosphere?
What is ozone?
a form of oxygen that has three oxygen atoms in each molecule instead of the usual two
What is water vapor?
water in the form of gas
What is the atmosphere important?
it makes conditions on Earth suitable for living things
Does air have mass?
What is density?
the amount of mass in a given volume of air
What is pressure?
the force pushing on an area or surface
What is air pressure?
the result of the weight of a column of air pushing down on an area
Denser air exerts ______ pressure than ______ dense air.
denser air exerts MORE pressure than LESS dense air.
Whats a barometer?
an instument that is used to measure air pressure
What are the two different kinds of barometers?
mercury barometers and aneroid barometers
What are units of mercury?
inches of mercury
What is the altitude?
the distance above sea level
Air pressure ______as altitude ______
Air pressure DECREASES as altitude INCREASES
What are the four main layers of the Earth's Atmosphere?
tropsphere, stratosphere, mesosphere, and the thermosphere
Describe the troposphere.
where Earth's weather occurs
Describe the stratosphere.
contains the ozone layer
Describe the mesosphere.
protects Earth's surface from being hit by most meteroids
Describe the thermosphere.
the outermost layer of the atmosphere it is divided into two layers: ionospere which contains ions and then the exosphere is the outer layer of the troposphere
What are pollutants?
harmful substances in the air, water, or soil
What are some natural sources of air polution?
forest fires, soil erosion, and dust storms
What are some human activities that effect air polution?
farming and construction
What can fossil fules cause?
Smog and Acid Rain
What is photochemical smog?
formed by the action of sunlight on pollutants such as hydrocarbons and nitrogen oxides