Which of the following statements regarding Barchan is/are correct?

1. It is a crescent shaped mound of sand, which is deposited by the wind blowing constantly from one direction in a desert.

2. The windward side has a convex steep slope with maximum height at the centre.

3. Two ends of Barchan are called horns and point opposite to the direction the wind blows.

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Which of the following statements regarding Regur soil is/are correct?

1. It is a light coloured, clayey and fertile soil.

2. It is developed on Deccan basaltic lava under hot and humid conditions.

3. Cotton is extensively cultivated in this soil.

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Which of the following statements regarding clouds is/are correct?

1. Clouds are classified on the basis of altitude and their form.

2. According to altitude they are classified as High, Middle and Low clouds.

3. Stratus, Nimbostratus and Stratocumulus are high clouds.

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Consider the following statements regarding 'fronts':

1. The movement of a front causes a slow change in weather in the area over which it moves.

2. Cold fronts are associated with thunderstorms.

3. Warm front is the boundary between an advancing mass of warm air where it is overriding and rising above a mass of colder air.

Which of the statements given above is/are correct?