A: Lightning thunder and heavy rain accompany volcanic activity. R: Volcanoes throw water vapour and charged particles in the atmosphere.

A: Commercial fisheries have not developed in tropics. R: The demand for marine food from low income population is low in the tropics.

A: Soils in some parts of Punjab, Haryana and Rajasthan are saline. R: Evaporation exceeds precipitation.

A: Area along the Equator records the highest temperature throughout the year. R: On the equator, days and nights are equal for the largest part of the year.

A: The monsoons arrive suddenly in India in June. R: The monsoonal low pressure trough is well-developed over India.

A: India built dams and reservoirs to manage water resources. R: India had enough experience in canals.

A: The life expectancy in European countries is very high. R: European countries have low mortality rate.

A: The nomadic herders slaughter their animals for meat. R: Animals form the chief source of food and livelihood for nomadic herders.

A: Exploitation of equatorial rain forest of Amazon basin is not easy. R: This region is very rich in several types of deadly animals and insects.