Air
the condition of earth's atmosphere at a particular time and place
What is weather?
the force pushing on an area or surface
What is pressure?
Scientists use this criteria to classify the layers of the atmosphere
What is a change in temperature?
the shallowest layer of earth's atmosphere but it contains most of the mass of the atmosphere
What is the troposphere?
harmful substances in the air, water or soil.
What are pollutants?
the envelope of gases that surrounds the planet
What is the atmosphere?
the result of the wieght of a column of air pressing down on an area
What is air pressure?
the inner or lowest layer of earth's atmosphere in which weather occurs.
What is the troposphere?
the layer of atmosphere in which the inner portion is colder and the upper portion is warmer because of ozone.
What is the stratosphere?
forest fires, volcanic activity, soil erosion and dust storms
What are some natural sources of pollution?
nitrogen, oxygen, carbon dioxide, water vapor, and many other gases in small amounts
What is the composition of earth's atmosphere?
the amount of mass in a given volume.
What is density?
second layer of the atmosphere and contains the Ozone layer.
What is the stratosphere?
the layer of the atmosphere in which we see the trail of hot glowing gases left behind by a meteor
What is the mesosphere?
burning of fossil fuels such as coal, gas or oil, farming, construction
What are human activities that cause pollution?
78%
What percentage of earth's atmosphere is nitrogen?
the instrument used to measure air pressure
What is a barometer?
the middle layer of the atmosphere that protects earth from being hit by most meteoroids
What is the mesophere?
the outer portion of the thermosphere
What is the exosphere?
the brown haze that forms in sunny cities due to the action of sunlight on pollutants.
What is photochemical smog?
21%
What percentage of earth's atmosphere is oxygen?
mass divided by volume
the equation for density
the outermost layer of earth's atmosphere, has no outer limit and blends with outer space
What is the Thermosphere?
The lower layer of the thermosphere with electrically charged particles called ions.
What is the ionosphere?
forms when nitrogen oxides and sulfur oxides combine with water in the air to form nitric acid and sulfuric acid.
What is acid rain?