anemometer a weather instrument that measures wind speed with wind-catching cups (SRB, IG)

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1 FOSS Weather on Earth Module Glossary 3 rd Edition 2012 absorb to soak in air the mixture of gases surrounding Earth air pressure the force exerted on a surface by the mass of the air above it anemometer a weather instrument that measures wind speed with wind-catching cups atmosphere the layer of gases surrounding Earth. The layers include the troposphere, stratosphere, mesosphere, thermosphere, and exosphere. atmospheric measurement weather data collected in the atmosphere with radiosondes attached to balloons (IG) barometer a weather instrument that measures air pressure blizzard a severe storm with low temperatures, strong winds, and large quantities of snow climate the average or typical weather conditions in a region of the world climatologist scientists who study climate (IG) cloud tiny droplets of water, usually high in the air cold front the contact zone where a cold air mass overtakes a mass of warm, moist air compress to force air into a smaller space (IG) condensation the process by which water vapor changes into liquid water, usually on a surface condense when water vapor touches a cool surface and becomes liquid water (IG) conduction the transfer of energy from one place to another by contact conserve to use carefully and protect contract to get smaller; to take up less space (IG) convection current a circular movement of fluid (such as air) that is the result of uneven heating of the fluid dew water that condenses on a surface when the temperature drops at night drought a less-than-normal amount of rain or snow over a period of time Earth the third planet from the Sun, known as the water planet FOSS Weather on Earth Module Vocabulary/Glossary Terms, 3 rd Edition of 5

2 earth material the various solids, liquids, and gases that make up the earth (IG) energy transfer the movement of energy from one place to another evaporate when liquid water in a material dries up and goes into the air (IG) evaporation the process by which liquid water changes into water vapor exosphere the layer of the atmosphere above the troposphere. The exosphere makes the transition from the atmosphere to space. expand to get bigger; to take up more space (IG) experiment an investigation designed to find out how variables affect outcomes (IG) fluid a liquid or a gas (IG) fog water droplets that condense from the air close to the ground forecast a scientific weather prediction (IG) forecasting predicting future events or conditions, such as weather fossil fuel the preserved remains of organisms that lived long ago and changed into oil, coal, and natural gas fresh water water that is in lakes, rivers, ground water, soil, and the atmosphere (IG) front the leading edge of a moving air mass frost frozen condensation gas a state of matter with no definite shape or volume; usually invisible glacier a large mass of ice that along with ice caps contains about seventy percent of Earth s fresh water (IG) greenhouse effect when heat builds up in the atmosphere and causes Earth s temperature to rise ground water water found in the spaces between rock particles (sand, gravel, pebbles), and in cracks and spaces in solid rock (IG) hail precipitation in the form of small balls or pellets of ice humidity water vapor in the air hurricane a severe tropical storm that produces high winds hygrometer a weather instrument that measures humidity FOSS Weather on Earth Module Vocabulary/Glossary Terms, 3 rd Edition of 5

3 ice cap an ice mass that along with glaciers contains about seventy percent of Earth s fresh water (IG) kinetic energy energy of motion lake a body of fresh water surrounded by land (IG) less dense when an object floats in water, it is less dense than water (IG) liquid a state of matter with no definite shape but a definite volume mass the amount of material in something (IG) matter anything that has mass (IG) mesosphere the layer of the atmosphere above the stratosphere meteorologist a scientist who studies the weather more dense when an object has more mass for its size than another object. When an object sinks in water, it is more dense than water. (IG) ocean body of salt water that comprises ninety-seven percent of Earth s water (IG) ozone a form of oxygen that forms a thin layer in the stratosphere photosynthesis a process used by plants and algae to make sugar (food) out of light, carbon dioxide, and water precipitation rain, snow, sleet, or hail that falls to the ground predict to estimate a future event based on data or experience pressure the force or push caused by moving molecules (IG) radiant energy energy that travels through air and space radiation energy that travels through air and space radiosonde an instrument sent into Earth s atmosphere to measure temperature, pressure, and humidity rain liquid water that is condensed from water vapor in the atmosphere and falls to Earth in drops ray a wave; the form that solar energy travels to the Earth in (IG) recycle to use again reflect to bounce off an object or surface renewable resource a natural resource that can replenish itself naturally over time. Air, plants, water, and animals are renewable resources. FOSS Weather on Earth Module Vocabulary/Glossary Terms, 3 rd Edition of 5

4 reradiation when the warmed Earth radiates energy back into the air (IG) river a large natural stream of water emptying into an ocean, lake, or other body of water (IG) salt water ocean water (IG) season a time of year that brings predictable weather conditions to a region on Earth severe weather out-of-the-ordinary and extreme weather conditions sleet precipitation in the form of ice pellets created when rain freezes as it falls to Earth from the atmosphere snow precipitation in the form of ice crystals grouped together as snowflakes solar collector any object or material placed in the Sun to absorb solar energy for transfer to water or air (IG) solar energy heat and light from the Sun solar energy exposure the amount of energy from the Sun that falls on an object; dependent upon the intensity (brightness) of the sunlight, and the length of time the sunlight falls on the object (IG) solar water heater a system designed to use solar energy to heat water (IG) stationary front the contact zone where a warm air mass and a cold air mass come together and stop moving stratosphere the layer of the atmosphere above the troposphere. The ozone layer is in the stratosphere. Sun the star at the center of the solar system surface measurement weather data collected at Earth s surface with weather instruments (IG) temperature a measure of how hot the air is thermometer a weather instrument that measures temperature thermosphere the layer of the atmosphere above the mesosphere thunderstorm severe weather that results from cold air flowing under a warm, humid air mass over the land tornado a rapidly rotating column of air that extends from a thunderstorm to the ground. Wind speeds can reach 400 kilometers (km) per hour or more in a tornado. transpiration the process by which water escapes into the air through plants troposphere the layer of the atmosphere that begins at Earth s surface and extends upward for 9 to 20 km. Weather happens in the troposphere. FOSS Weather on Earth Module Vocabulary/Glossary Terms, 3 rd Edition of 5

5 typical the average weather that is expected in a given area (IG) uneven heating the result of different amounts of energy being transferred to adjacent surfaces (IG) variable anything you can change in an experiment that might affect the outcome (IG) visibility the distance one can see through the air at ground level (IG) warm front the contact zone where a warm air mass overtakes a cold air mass water cycle the global water-recycling system. Water evaporates from Earth s surface, goes into the atmosphere, and condenses. It returns to Earth s surface as precipitation in a new location. water vapor the gaseous state of water weather the condition of the air around us. Heat, moisture, and movement are three important variables that describe weather. weather map a map that shows weather data in symbols weather variable data that meteorologists measure. These include temperature, wind speed and direction, air pressure, cloud cover, and precipitation. wind air in motion wind direction the compass direction from which the wind is coming (IG) wind meter a weather instrument that measures wind speed with a small ball in a tube wind speed how fast the air is moving past an observation point (IG) wind vane a weather instrument that measures wind direction FOSS Weather on Earth Module Vocabulary/Glossary Terms, 3 rd Edition of 5

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