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