Questions

Sea appears blue in colour due to the scattering of the rays when they hit water molecules

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.

The Periyar Sanctuary covers an area of 777sq km. It was established in 1949. Elephants , Gaurs, leopards, solth bear, sambhars, barking deer, wild dogs, wild boars, black Nilgiri langur and water birds can be seen in this sanctuary.

The Chemical name of Gold is Aurum with symbol Au with atomic number 79 and a group 11 element. In its purest form, it is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal.

Chemically, gold is a transition metal.