Which is used in cryogenics?

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

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

Which of the following  gives power to the rock cycle?

In the beginning earth was a ball of molten:

The biggest single use of oxygen is in the production of steel from :

The atmosphere of the earth is different from that of its neighbor because of the presence of:

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

Recycling plastics helps conserve the:

Which are not removed by water treatment?