| A | B |
|---|
| atmosphere | Earth's air, made up of a thin layer of gases, solids, and liquids |
| troposphere | layer of Earth's atmosphere that is closest to the ground |
| ionosphere | layer of electronically charged particles in the thermosphere that absorbs AM radio waves during the day and reflects them back at night |
| ozone layer | layer of the stratosphere with a high concentration of ozone; absorbs most of the Sun's harmful ultraviolet radiation |
| ultraviolet radiation | type of energy that comes to Earth from the Sun, can damage skin and cause cancer, is mostly absorbed by the ozone layer |
| chlorofluorocarbons (CFCs) | group of chemical compounds used in refrigerators, air conditioners, foam packaging, and aerosol sprays; may enter atmosphere and destroy the ozone |
| exosphere | layer of Earth's atmosphere farthest from the Earth |
| stratosphere | layer of Earth's atmosphere where ozone layer is located |
| What gas makes up 78% of the atmosphere? | nitrogen |
| smog | brown haze caused by pollutants, such as car exhaust, that mix with chemicals and oxygen |
| What solids are in Earth's atmosphere? | dust, salt, pollen |
| Name, in order, the 5 layers in Earth's atmosphere, beginning with the highest layer | exosphere, thermosphere, mesosphere, stratosphere, troposphere, (Earth) |
| contains 99% of the water vapor and 75% of atmospheric gases | troposphere |
| Where does the space shuttle orbit the Earth | exosphere |
| Where is atmospheric pressure the greatest? | troposphere |
