The boiling point of oxygen, nitrogen, argon and neon are -183^o C , - 196^oC and -246^oC respectively. Which of these has lowest boiling points ?

The roots of the trees are damaged due to the acid rain which causes leaching away of:

The rock cycle is a very slow process as the plates of the earth's crust are moving only a few:

Which gas is used to fill light bulbs to prevent the tungsten filament burning away?

Fresh air, fresh water, biomass, all these represents which resources?

Which of the following  gives power to the rock cycle?

After domestic use ,the water will be contaminated with soap, detergent, grease, food, body waste and factory waste.This waste water is called :-

The first atmosphere was mainly formed from:

Plants gradually used carbon dioxide and water to produce oxygen and glucose. This process is called:

Animal life came into existence, after the sufficient presence of: