The gas which causes greenhouse effect is

Most of the water on the earth surface is found in

Ozone hole was first observed over

Which of the following organisms are very sensitive to the levels of contaminants like sulphur dioxide in air?

Which one of the following factors are not responsible for formation of soil?

State any two harmful effects of air pollution.

(i) Define the term 'smog'.
(ii) Name two types of diseases caused by regularly breathing the polluted air.

Do all organisms require water? Give reasons.

(a) Why do terrestrial life-form require fresh water?
(b) Give two examples where fresh water can be found in the frozen form on the earth.

What is the function of decomposers in Biogeochemical cycles?

Briefly describe the mineral cycle.

What is the role of the atmosphere in climate control?

Mention a cause and a consequence of acid rain.

What are the sources of water pollution?

What is "greenhouse effect'? What would be its effect? name two greenhouses gases.

What is greenhouse effect? What will happen if concentration of greenhouse gases increases in the air?

Is it necessary to replenish forests?

You know that the ozone layer of staratosphere of atmosphere protect us from ultraviolet radiations coming from the sun.Ozone layer is decreasing Scientist when talk about ozone 'hole' it means ozone layer at certain area has become very thin. Depletion of ozone layer is worldwide problem. Read more about ozone layer and its protection.
Answer the following questions based on the above information:
(a) On what three precautions/methods you will stress upon while organizing canpaign for creating awareness amongst masses?
(b) Which values are displayed by the students?

April 22, is celebrated by countries all over the world as the Earth Day clean Delhi took the initiative and organised Saving the greens campaign.
Equipped with gloves,rakes,gunny, bags and a lot of enthusiasm,students  assembled at a park on the Ridge and took upon themselves the task of cleaning the Ridge. Activities that were carried out included picking up all the polybags that were littering a part of the ridge and removing advertisements nailed to trees.disturbing pamplets at the crossing to passersby In about on hours time the children managed to collect about 20 large gunny bags full of plastic
Answer the following questions based on above information
(a) What are messages sent by their activity to the public of Delhi?
(b) What is your suggestion?
(c) Which values are displayed by the childrean?