| A | B |
|---|
| electromagnetic waves | a form of energy that can travel through space |
| radiation | the direct transfer of energy by electromagnetic waves |
| humidity | a measure of the amount of water vapor in the air |
| ultraviolet radiation | a form of energy with wavelengths that are shorter than visible light |
| scattering | reflection of light in all directions |
| greenhouse effect | the process by which gases hold heat in the air |
| thermal energy | the total energy of motion in the molecules of a substance |
| temperature | the average amount of energy of motion in the molecules of a substance |
| thermometer | an instrument used to measure temperature |
| heat | the energy transferred from a hotter object to a cooler one |
| psychrometer | an instrument used to measure relative humidity |
| precipitation | any form of water that falls from clouds and reaches Earth's surface |
| wind | the horizontal movement of air from an area of high pressure to an area of lower pressure |
| anemometer | an instrument used to measure wind speed |
| wind-chill factor | increased cooling caused by the wind |
| local winds | winds that blow over short distances |
| land breeze | the flow of air from land to a body of water |
| sea breeze | the flow of air from an ocean or lake to the land |
| evaporation | the process by which water molecules in liquid water escape into the air as water vapor |
| droughts | long periods of unusually low precipitation |
