Questions

Chemical weathering is the process of altering rocks chemically when they are broken down. It includes hydrolysis, oxidation, acid rain, etc...

The Sales Order is a confirmation document sent to the customers before delivering the goods or services. 

Sales Order (SO) can be created once the quote is accepted by your prospective customer and the Purchase Order (PO) is sent by the customer for further processing.

Separation of an employee exists when the service of an employee comes to an end because of one reason or other. "Separation of employment" refers broadly to the process of managing the termination of employment. It is a sensitive issue for any organization. 

Types of separation:

1) Volunntary:

a) Resignation
b) Job abandonment
c) Retirement

2) Involuntary:

a) Layoff
b) Dismissal
c) Plant closure
d) Death or Disability.

The Parliament cannot amend those provisions which form the ‘basic structure’ of the Constitution. This was ruled by the Supreme Court in the Kesavan and a Bharati Case. (1973)

Basic Structure of the Indian Constitution is not defined. But according to SC, the basic structure can be evolved but cannot be destroyed. Hence it falls within the constituent powers of the Parliament. Hence both 1 and 3 are correct.

Convex mirror is used as rear view mirror in vehicles. Because the image is smaller, more image can fit onto the mirror, so a convex mirror provides for a larger field of view than a plane mirror. This is why they are useful.