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An instrument for measuring the speed of the wind, or of any current of gas.

1.An instrument measuring atmospheric pressure, used esp. in forecasting the weather and determining altitude.

the state of the sky when it is covered by clouds

A system of interlocking and interdependent food chains

A series of organisms each dependent on the next as a source of food.

A wind from the direction that is most usual at a particular place or season.

1.The process of eroding or being eroded by wind, water, or other natural agents.