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.

Select the answer using the code given below :

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.

Select the answer using the code given below:

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?

Consider the following statements regarding soils :

1. Soils having a very high content of sodium and calcium and pH of more than 7.0 are alkaline soils.

2. Black cotton soil had developed on the Deccan basaltic lava under hot and humid conditions.

3. Laterite soils are characterised by a deep weathered layer from which silica has been leached.

Which of the statements given above is/are correct?