With reference to "water vapour", which of the following statements is/are correct? 1. It is a gas, the amount of which decreases with altitude. 2. Its percentage is maximum at the poles. Select the answer using the code given below:

Statement 1: Water vapour is a gas in the atmosphere, and its concentration generally decreases with altitude because most of it comes from surface evaporation and is concentrated in the lower troposphere. Verdict: Correct.

Statement 2: Water vapour is not maximum at the poles; it is highest in warm, humid tropical regions and lowest in cold polar areas. Verdict: Incorrect.

Therefore, only Statement 1 is correct.