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

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

If a lake ecosystem is overloaded by nutrients , it increases the growth of plants and:

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

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

The first atmosphere was mainly formed from:

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

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 ?

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

Plant life developed in warm shallows seas. What did they release into the atmosphere after using carbon dioxide?