| A | B |
|---|
| Weather | The condition of the Earth's atmosphere at a particular time and place |
| Atmosphere | The mixture of gasses that surrounds the Earth. The outermost of the four spheres into which scientist divide Earth. |
| Ozone | A form of qxygen that has 3 oxygens atoms in each molecule instead of the usual 2; toxic oxygen |
| Water Vapor | The invisible gaseous form of water |
| Air Pollution | A change to the atmosphere that has harmful effects |
| Emissions | Solid particles and gases released into the air from a smokestack or motor vehicle |
| Photochemical Smog | A brownish haze that is a mixture of ozone and other chemicals, formed when nitrogen oxides, hydrocarbons, and other pollutants react with each other in sunlight |
| Temperature Inversion | Condition in which a layer of warm air traps polluted air close to Earth's surface |
| Acid Rain | Cause by the release of molecule of Sulfur dioxide and nitrogen dioxied into the air |
| Ozone Layer | The layer of atmosphere that contains a higher concentration of ozen than the rest of the atmosphere |
| Chlorofluorocarbons | Chlorine compounds formerly used in air conditioners, refridgerators, and spray cans - also called CFC's |
| Greenhouse Effect | The process by which heat is trapped in the atmosphere by water vapor, carbon dioxide, methane, and other gasses that form a "blanket" around Earth |
| Global Warming | A gradual increase in the temperature of Earth's atmosphere |
| Air Pressure | The result of the weight of a column of air pushing down on an area |
| Barometer | An instrument that is used to measure changes in air pressure |
| Millibars | Unit of air pressure |
| Density | The amount of mass in a given volume of air |
| Altitude | Distance above sea level (elevation) |
| Tropo | Turning or changing |
| Troposphere | First layer of the atmosphere where Earth's weather occurs |
| Stratosphere | Contains the ozone layer |
| Meso | Middle |
| Mesosphere | The middle layer of the atmosphere, above the stratosphere |
| Thermo | Heat |
| Thermosphere | The top layer of the atmosphere which extends out into space |
| Ionosphere | The lower level of the thermosphere |
| Exo | outer |
| Exosphere | The outer layer of the thermosphere |
| Aurora Borealis | The Northern Lights that occurs in the ionosphere |
