When rocks are broken down by the action of weather, the particles of rock are transported , deposited and buried to form:

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

In motor vehicles , due to the enclosed space of an engine, the fuel does not usually burn completely owing to lack of oxygen. Which of the following is formed as a result of this?

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

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

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

Which of the following  gives power to the rock cycle?

Plant and animal life continued to develop over millions of years until the earth reached its present balance of:

The water vapour condensed and fell back to the surface, forming the first:

Which is used in cryogenics?