Troposphere - The layer is closest to Earth and where all weather takes place., Stratosphere - The layer where the ozone layer can be found and is what protects us from the dangerous rays of the sun, Mesosphere - The layer where we see meteors and is the middle layer., Evaporation - Water heated by the Sun turns to water vapor (gas) as it moves higher in the atmosphere, Condensation - Water vapor cools in the atmosphere forming clouds of water droplets, Precipitation - When clouds become heavy they release water in the form of rain, snow, sleet, or hail., Runoff - Water runs from higher elevation back into rivers, oceans, and the ground., Water vapor - The gas form of water, Anemometer - An instrument used to determine wind speed; as cups turn they count how many times they spin a given period of time, Weather vain - Tells the direction of the wind, Rain gauge - Measures the amount of precipitation; markings on the side measure in centimeters or inches, Thermometer - Used to measure temperature; scale may be in Fahrenheit or Celsius, Warm front - A warm air mass overtakes a cool air mass; warmer, more humid air brings precipitation. Symbol: a line with half circles (usually red)., Cold front - A cold air mass overtakes a warm air mass; may bring severe storms. Symbol: a line with triangles (usually blue), Stratus - Low, gray clouds that cover the sky; typically bring a steady, light rain, Cumulus - Big, white, fluffy clouds; usually mean good weather, Cirrus - High, thin, wispy clouds that signal a change in the weather., Cumulonimbus - High dark clouds that signal thunderstorms., Thunderstorm - A severe storm with lightning, thunder, heavy rain and strong winds., Hurricane - A large storm that forms over warm ocean water with very strong winds that blow in a circular pattern around the center, or eye, of the storm., Tornado - A funnel-shaped cloud that comes down from a storm cloud with winds spinning at very high speeds., Meteorologist - A scientist who studies and forecasts the weather, Thermosphere - The layer is extremely cold at the lower end and extremely hot at the upper end., Exosphere - The layer is the furthest layer from Earth.,

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