Unit D: Chapter 2. Vocabulary Observing Weather. Mrs. Tweedie April 2006. What is the atmosphere?. The atmosphere is the air that surrounds Earth. The atmosphere contains water vapor as well as small pieces of dust and pollution. What is the thermosphere?.
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The atmosphere is the air that surrounds Earth. The atmosphere contains water vapor as well as small pieces of dust and pollution.
Temperatures in the thermospherecan be higher than 2,000° C. Air particles can be miles apart in this part of the atmosphere.
Temperatures are lower in the mesosphere and can go below -120° C.
The stratosphere contains the atmosphere’s ozone. Temperatures here are usually below freezing. Long distance jets sometimes fly low in the stratosphere.
Ozone is a type of oxygen. It absorbs harmful rays from the sun.
The troposphere is the layer of the atmosphere where you live. Air particles in this layer are close enough for you to breathe easily. All our weather takes place in the troposphere.
Weather is what is happening in the atmosphere at a certain place. Temperature, wind, and precipitation are all parts of weather.
Meteorologists are scientists who study weather and the atmosphere.
Blizzards are large snowstorms.
Hurricanes are strong, dangerous storms that form over warm ocean waters. Hurricanes have winds of 75 miles per hour or more.
Tornadoes are violent windstorms. The winds are so strong that they can destroy homes and lift trains from their tracks.
Temperature is a measure of how hot or cold something is.
An air mass is a large body of air with the same temperature and moisture.
A front is a place where two air masses of different temperatures meet. Most weather changes happen at fronts.
Precipitation is measured by using a rain gauge or a snowboard.
Thunderheads are giant clouds that form along cold fronts.
Wind is the movement of air. Wind happens because air pressure is different in different places.
An anemometer (an/uh/mahm/ut/er) measures wind speed.
A weather map is a map that shows weather data for a large area. The maps show temperatures, precipitation, warm and cold fronts, and areas of high and low air pressure.