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Which of the following is/are correctly matched?
1. Water vapour ————————————- important for water cycle.
2. Nitrogen ——————————————————– supports burning.
3. Dust ——————————————————– combination of gases.
Which of the following is correct order with respect to amount present in air?
Which of the following is/are true for wind mill?
1. The windmill is used to draw water from tubewells and to run flour mills.
2. Windmills are also used to generate electricity.