What are the uses of water ?
What are the different hypotheses regarding the origin of the earth ?
What do you mean by noise pollution ?
How many principal gases are there in the atmosphere ?
Describe the principal characteristics of environment?
Explain with examples the natural changes of environment?
Explain the necessity of environmental studies?
What is the meaning and objective of environmental education ?
Define ecosystem?
What is environment ?
Define water pollution?
What do you mean by waste water ?
Discuss the sources of odour pollution?
The mystery beneath the crust – explain?
What are the sources of water pollution ?