61.
What is oil slick?

62.
India ranks __________ amongst the wind-energy producing countries of the world.

63.
World wildlife week is observed during

64.
The concept that 'population tends to increase geometrically while food supply increases arithmetically' was put forward by

65.
About ____ of the meteorologists and atmospheric scientists in the United States work in the field of weather forecasting.

66.
_________ power station at the mouth of the river blocks the flow of polluted water into the sea.

67.
What is the animal symbol of W. W. F (World Wildlife Fund) ?

68.
Minamata disease was caused by pollution of water by

69.
What is "temporary threshold shift"?

70.
In an average year, more people die from this than from any other natural disaster.