Question

The process causing an undesirable change in environment

Answer 1

Pollution

1. Any addition in air, water, soil that threatens the health and activities of humans or other living organism.
2. There are different types of pollution, which are either caused by natural events (like forest fires) or by man-made activities (like cars, factories, nuclear wastes, etc.).
3. These are further classified into the following types of pollution: air pollution, noise pollution, water pollution, etc.