atmosphere - The blanket of air that surrounds Earth., humidity - The amount of water vapor in the air., temperature - How warm or cool something is., water vapor - Water in the air that you cannot see., weather - What the atmosphere is like at a certain time and place., thermometer - A tool that measures temperature., weather station - A set of equipment that measures temperature and other weather information. They normally take these measurements automatically several times a day., drought - When not enough rain falls for a long period of time., evaporation - When a liquid water changes to water vapor., precipitation - Water that falls to the ground in the form of rain, snow, or sleet., radar - A tool that is used to find far away objects in the air and measure their distance or speed., rain gauge - A tool that measures rainfall.,

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