| A | B |
|---|
| Air pressure | The pressure caused by the weight of a column of air pushing down on an area. |
| Precipitation | Any form of water that falls from clouds and reaches Earth's surface. |
| Condensation | The process by which molecules of water vapor in the air become liquid water. |
| Evaporation | The process by which water molecules in liquid water escape into the air as vapor. |
| Humidity | The amount of water vapor in a given volume of air. |
| Relative humidity | The percentage of water vapor in the air compared to the maximum amount of water vapor that air can contain at a particular temperature. |
| Jet Streams | Bands of high-speed winds about 10 kilometers above Earth's surface. |
| Coriolis effect | The change that Earth's rotation causes in the motion of objects and that explains how winds curve. |
| Water vapor | Water in the form of a gas. |
| Collection | The holding of water in one location for an extended period of time. |
| Transpiration | The release of water vapor into the air from plant respiration. |
| Thermomoter | An instrument used to measure temperature. |
| Water cycle | The continual movement of water among Earth's atmosphere, oceans and land surfaces. |
| Psychrometer | An insturment used to measure relative humidity. |
| Barometer | An instrument used to measure changes in air pressure. |
| Sea breeze | The flow of cooler air from over an ocean or lake toward land. |
| Land breeze | The flow of air from land to a body of water. |
| Global winds | Winds that blow steadily from specific directions over long distances. |
| Local winds | Winds that blow over short distances. |
| Anemometer | An instrument used to measure wind SPEED. |
| Wind vane | An instrument used to determine wind DIRECTION. |
| Rain gauge | An instrument used to measure precipitation. |
| Radiation | The direct transfer of energy by electromagnetic waves. |
| Conduction | The direct transfer of thermal energy from one substance to another that it is touching. |
| Convection | The transfer of thermal energy by the movement of a fluid such as water or air. |
| Wind | The horizontal movement of air from an area of high pressure to an area of lower pressure. |
| Greenhouse effect | The process by which heat is trapped in the atmosphere by gases that form a "blanket" around Earth.. |
| Visible light | The area of the electromagnetic spectrum that contains all the wavelengths that can be seen by humans. |
| Infrared radiation | A form of electromagnetic energy that has wavelengths that are longer than red light. |
| Ultraviolet radiation | an invisible form of energy with wavelengths that are shorter than violet light. |
| Scattering | The process of dust particles and gases in the atmosphere reflecting light in all directions. |
| Electromagnetic waves | Waves that transfer electric and magnetic energy through the vacuum of space. |
| Mass | The amount of a substance. |
| Weight | The measurement of the pull of gravity on the mass of a substance. |
| Volume | The amount of space a substance takes up. |
| Density | The amount of mass of a substance in a given volume. |
| Vapor | Another term for the gas form of a substance that is normally a liquid or solid at room temperature. |
