How many principal gases are there in the atmosphere ?
Explain with examples the natural changes of environment?
What are the different hypotheses regarding the origin of the earth ?
Define environmental studies?
What do you mean by noise pollution ?
Explain the necessity of environmental studies?
What are the causes of environmental change ?
What do you mean by waste water ?
Give a brief account of the components of environment.
What are the ways to conserve forest ?
Describe the principal constituents of earth?
Define water pollution?
The mystery beneath the crust – explain?
What are the uses of water ?
What do you mean by environmental change ?