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One of the simplest weather forecasting techniques involves examining changes in pressure over time. Which instrument is used to collect this data? A. thermometer B. anemometer C. barometer D. hygrometer

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The correct answer is Barometer.

A barometer is a instrument which is used to measure the air pressure of the atmosphere. The weather conditions has the tendency to change the atmospheric air pressure. Many measurements instruments are used today to measure it.

Barometer is kept at a place and any slight change in the air pressure caused due to change in weather conditions is recorded by it.