| A | B |
|---|
| Radiation | Energy that travels across distance in the form of electromagnetic waves |
| Smog | The combination of smoke and fog; a chemical reaction in the air between unburnt fuels, fumes and other gases (sunlight triggers this reaction |
| Infrared | Radiation of lower frequencies than visible light. |
| Density | A property of matter representing the mass per unit volume |
| Greenhouse Effect | The process by which certain gases in a planet's atmosphere absorb and emit infrared radiation, resulting in an increase in surface temperature |
| Altitude | The distance above sea level |
| Convection | A process by which energy is transferred in gases and liquids, occurring when a warmer, less dense area of gas or liquid is pushed up by a cooler, more dense area of the gas or liquid |
| Evaporation | The process of liquid becoming a gas through an increase in energy (temperature) |
| Conduction | The process by which energy is transferred from a warmer object to a cooler object by means of physical contact |
| Condensation | The process of reducing a gas to a liquid through lowering of energy (temperature) |
| Fossil Fuels | Fuel formed from the remains of prehistoric organisms that is burned for energy |
| Ozone | A gas molecule that consists of three oxygen atoms and protects Earth from the harmful rays of radiation from the Sun. |
| Cycle | A series of events or actions that repeat themselves over and over |
| Greenhouse Gases | Gases, such as carbon dioxide and methane, that absorb and give off infrared radiation as part of the greenhouse effect |
| Air Pollution | Harmful materials added to the air that can cause damage to living things and the environment |
| Ultraviolet Radiation | Radiation of higher frequencies than visible light, which can cause sunburn and other types of damage |
| Atmosphere | The outer layer of gases of a large body in space - has 4 layers |
| Particulates | Tiny particles or droplets, such as dust, dirt, and pollen, that are mixed in with air |
| Convection | The transfer of energy from place to place by the motion of heated gas or liquid |
