Q3.

Which of the following statements with reference to Salt Weathering is/are correct? 
1. Salt crystallisation is the most effective of all the salt weathering processes. 
2. Salt crystal growth is more effective over sedimentary rocks as compared to igneous rocks.

Q4.

Which of the following statements with reference to Surface inversion of temperature is/are correct? 
1. It causes instability in the lower layers of the atmosphere. 
2. This inversion commonly lasts for a few hours until the Sun comes up.

Q5.

Identify the cloud on the basis of the following characteristics: 
I. They look like cotton wool. 
II. They exist in patches and have flat base. 
III. They are generally formed at a height of 4 to 7 km.