Which of the following statements with regard to the expansion of the desert in Rajasthan is/are correct?

I. The predominant wind direction in Rajasthan is North-East to South-West, so the tendency for desertification has been more in that direction.
II. The Thar desert is dominantly a monsoon-driven sand desert where wind erosion is a major problem during the summer months. While the Aravalli range is a major barrier to the spread of the desert, rampant mining creating cuts in the range is leading to the spread of the desert.

Select the correct answer using the codes given below.

Consider the following statements:

I. The average rainfall in India is about $125$ cm.
II. The proportion of drought-prone areas to the total area in India is $30\%$.

Which of the statements given above is/are true?

Which one of the following phenomenon happens when the sun shines vertically over the Tropic of Capricorn in the Southern Hemisphere?

In the following question, there are two statements one as labelled Assertion (A) and another one as Reason (R). Select the correct answer using the codes given below.

Assertion (A): Mawsynram is the wettest place in India.
Reason (R): It receives heavy rainfall throughout the year.

Consider the following statements:

I. The movement of the isotherms is greater over the land than it is over the oceans.
II. Coastal regions have a smaller range of temperature than the continental interiors.

Which of the statements given above is/are correct?