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 ?

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