Questions

Jinping-I Dam  in China at 305 m (1,001 ft) high

Caverns are openings in the ground. Some famous caverns in the United States are Mammoth Cave, Carlsbad Caverns, Wind Cave, and Luray Caverns.

When rainwater trickles down through the soil, it carries carbon dioxide from the air with it. This turns acidic as it moves through the soil, joining with carbon from decaying plants. This acidic rainwater then eats away at, or erodes, the rock under the ground, forming a cave or cavern. For this process to occur, the rock must be the right type; limestone, dolomite, and gypsum are common.

A big bed of rock salt with the top portion of the bed containing potash (though not the variety used as ferilizer) has been discovered in Thar Desert at a depth of 100 metres. A massive belt of lead and zinc has been found in the Agucha area, while gold bearing rocks have been discovered in the Tuensang district of Nagaland.

Lord Dalhousie was appointed as Governer General of India from 1848–1856. The first railway line connecting Bombay and Thane was laid under his authority in 1853 and is known as the maker of Modern India. He made way For Telegraph Services in India. 

He is also called as Father of Indian Railways.