| Term | Definition |
| water cycle | the movement of water between the atmosphere and earth surface |
| 3 main types of clouds | cirrus,cumulus, stratus |
| condensation | the change from a gas to a liquid |
| temperature | average amount of energy |
| thermometer | thin glass tube with a buld at the end filled with mercury |
| conduction | the direct transfer of heat from one substance to another substance that is touching |
| heat energy (thermal energy) | the total energy of motion in the particles of a substance |
| evaporation | the process by which water molecules in liquid water escape into the air as water vapor |
| humidity | a measure of the amount of water vapor in the air |
| convection currents | the upward movement of warm air and the downward movement of cold air |
| heat | transfer of thermal energy from a hotter object to a cooler one |
| convection | the transfer of heat by a movement of a fluid |
| radiation | the direct transfer of energy by electromagnetic waves |