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| Used to describe a plant species that is pollinated by the wind. |
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| A divice that rotats freely to show the direction of the wind. |
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| an instrument measuring changes in atmospheric pressure, used in weather forecasting. |
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| Very cloudy, with no sun showing. |
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| a device used to measure the amount of rain that falls in a particular location. |
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| The boundary zone of an advancing cold-air mass as it replaces warmer air. |
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| the gently sloping advancing edge of a warm air mass that displaces colder air, bringing a temperature increase and heavy rain where the front makes contact with the ground. |
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| Measurement that compares the amount of water vapor in air with the amount the air can hold at a certain temperature. |
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| The temperature at which a volume of air cannot hold any more water vapor. |
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| A large body of air having similar properties or weather conditions. |
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| The boundary between warm and cold air masses. |
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