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Unit 3: Weather
Weather and the Earth's atmosphere
| Term | Definition |
|---|---|
| Electromagnetic Wave | Can transfer electric and magnetic energy through the vacuum of space |
| Greenhouse Effect | the trapping of heat near a planet's surface by certain gases in the planet's atmosphere |
| Thermal Energy | the total kinetic and potential energy of all the particles of an object |
| Convection | the transfer of thermal energy by the movement of a fluid |
| Conduction | the transfer of thermal energy from one particle of matter to another |
| Radiation | the transfer of energy by electromagnetic waves |
| Absorb | to take in or soak up |
| Wind | the horizontal movement of air from an area of high pressure to an area of lower 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` |
| Coriolis Effect | the effect of the Earth's rotation on the direction of winds and currents |
| Jet Stream | band of high speed winds about 10 kilometers above Earth's surface |
| Area | extent of a surface or piece of land |
| Model | representation of a complex process |
| Current | A large stream of moving water that flows through the oceans |
| El Nino | an abnormal climate event that occurs every 2 to 7 years in the Pacific Ocean, causing changes in the winds, currents, and weather patterns for 1 to 2 years and an unusual warming of the ocean's surface |
| El Nina | the periodic cooling of ocean surface temperatures |
| Gradually | slowly |
| Atmosphere | the relatively thin layer of gases that form Earth's outermost layer |
| Air Pressure | the pressure caused by the weight of a column of air pushing down on an area |
| Altitude | elevation above sea level |
| Stable | not likely to give way |
| Water Cycle | the continual movement of water among Earth's atmosphere, oceans, and land surface through evaporation, condensation, and precipitation |
| Evaporation | the process by which molecules at the surface of a liquid absorb enough energy to change to a gas |
| Condensation | the change in state from a gas to a liquid |
| Dew Point | the temperature at which condensation begins |
| 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 time |
| Precipitation | any form of water that falls from clouds and reaches Earth's surface as rain, snow, sleet, or hail |
| Cycle | a series of events that are regularly repeated in the same order |
| Air Mass | a huge body of air that has similar temperature, humidity, and air pressure at any given height |
| Front | the boundary where unlike air masses meet but do not mix |
| Cyclone | a swirling center of low air pressure |
| Anticyclone | a high-pressure center of dry air |
| Prevailing | existing at a particular time |
| Stationary | not moving |
| Meteorologist | a scientist who studies the causes of weather and tries to predict it |
| Synthesize | to make something |
| Storm | a violent disturbance in the atmosphere |
| Thunderstorm | a small storm often accompanied by heavy precipitation and frequent thunder and lightning |
| Hurricane | a tropical storm that has winds of about 119 kilometers per hour or higher |
| Tornado | a rapid whirling, funnel-shaped cloud that reaches down to touch the Earth's surface |
| Storm Surge | a "dome" of water that sweeps across the coast where a hurricane lands |
| Flood | an overflowing of water in a normally dry area |
| Drought | a long period of low precipitation |
| Approximate | close, but not completely exact |