Which one of the following types of soil is known by the local name 'Kari' in Kerala?

Consider the following statements:

I. The plain of younger alluvium is called Bhangar.
II. The plain of older alluvium is called Khadar.

Which of the statements given above is/are true?

Consider the following statements:

I. The piedmont plain where smaller rivers disappear is called Bhabar.
II. The belt where streams re-emerge is called Terai.

Which of the statements given above is/are true?

Tamil Nadu is a leading producer of mill-made cotton yarn in the country. What could be the reason? 
1. Black cotton soil is the predominant type of soil in the state. 
2. Rich pool of skilled labour is available. 
Which of the above is/are the correct reasons?