| A | B |
|---|
| Percentage of Oxygen | 21% |
| Gas that varies due to location | Water Vapor |
| Particles that are found in the air | dust, smoke, salt, other chemicals |
| Instrument that measures air pressure | barometer |
| Units used to measure air pressure | inches of mercury/millibars |
| Layer of atmosphere where weather occurs | troposphere |
| ozone is found in which layer | stratosphere |
| Layer of atmosphere that protects us from meteoroids | mesosphere |
| Harmful substances in the air, water, and soil | pollutants |
| Result of sunlight reacting with pollutants in the air | photochemical smog |
| layer of gases that surround the Earth | atmosphere |
| amount of mass in a given volume | density |
| distance above sea level | altitude |
| outer portion of the thermosphere | ionosphere |
| rain that contains more acid than normal | acid rain |
| barometer that is filled with mercury | mercury barometer |
| barometer that is made by an air-tight chamber | aneroid barometer |
| the greater the density = | the greater the air pressure |
| warmest layer of the atmosphere is | thermosphere |
| layer of the atmosphere that reflects radiowaves | thermosphere |
| the most abundant gas | nitrogen |
| layers of atmosphere are classified by | temperature |
| particles that enter the air when wood or coal is burned | soot |
| cause of acid rain | burning of coal and fuel |
| force per unit area | pressure |
| condition of Earth's atmosphere at a particular time and place | weather |
| layer of the atmosphere that auroras occur | ionosphere |
| as altitude decreases air pressure | increases |
| What is needed for fire to burn? | oxygen |
