What are the different hypotheses regarding the origin of the earth ?
What is the meaning of odour pollution ?
How many principal gases are there in the atmosphere ?
What are the uses of water ?
What are the sources of water pollution ?
Explain with examples the natural changes of environment?
What do you mean by noise pollution ?
What are the ways to conserve forest ?
Give a brief account of the components of environment.
What is the meaning and objective of environmental education ?
Explain the necessity of environmental studies?
Discuss the sources of odour pollution?
Describe the principal characteristics of environment?
Define environmental studies?
What are the measures to control odour pollution ?