water cycle - the movement of water between Earth's surface and the atmosphere, atmosphere - the mixture of gases and dust that surround the Earth, evaporation - the change from a liquid to a gas, transpiration - the process by which plants release water in the air through their leaves, condensation - the change from a gas to a liquid, precipitation - water that falls from the atmosphere in the form of rain, snow, sleet, or hail, runoff - water that flows over the land surface into other bodies of water, groundwater - water that soaks into the soil, weather - the condition of the atmosphere at a certain time and place, climate - the usual weather in an area over a long period of time, meteorologist - a scientist who studies weather, thermometer - a tool used to measure temperature, rain gauge - a tool used to measure the amount of precipitation, wind vane - a tool used to measure wind direction, anemometer - a tool used to measure wind speed, air pressure - the weight of the air above the Earth's surface, barometer - a tool used to measure air pressure, hygrometer - a tool used to measure the amount of humidity in the air, air mass - a large body of air with the same temperature and humidity, front - a place where 2 air masses meet, cold front - where a cold air mass meets and moves under a warm air mass bringing thunderstorms, warm front - where a warm air mass meets and moves over a cold air mass bringing clouds and light rain, stationary front - where 2 air masses meet and stop moving bringing lasting rain, jet stream - an air current in the upper atmosphere that flows from west to east, gulf stream - a warm ocean current in the Atlantic Ocean that mvoes warm waters toward the north keeping the weather mild along the east coast, El Nino - unusual warming of the surface water in the Pacific Ocean causing above average precipitation, La Nina - an unusual cooling of the surface water in the Pacific Ocean causing dryer seasons, Global Winds - predictable and stable wind patterns over the globe, Land Breeze - a convection current where air flows from land to sea during the nighttime, Sea Breeze - a convection current where air flows from sea to land during the daytime,

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