i need an explanation of OXYGEN CYCLE with a diagram .

 explain water cycle with a diagram?????

Define Global Warming?

 Please explain Oxygen Cycle?

describe the carbon cycle in detail with diagram ? its urgent

What are the causes of Soil Erosion?

 write causes and effects of air pollution

why is water called a wonder liquid

what is conservation of forest ?

role of atmosphere in climate control?

What is rain water harvesting? Write a note on advantages of rain water harvesting?

1 Draw a well labelled diagram to show carbon cycle in nature.

2What causes acid rain?

3What is humus? What is its function in the soil?

4What is biological fixation? How is it different from nitrification? Give an E.g. Of organism involved in each of these?

5What is contribution of photosynthesis in carbon cycle?

6Draw a well labelled diagram to show N2 cycle in nature?

write a paragraph for about 100-130 words on endangered species and steps to preserve animals.

Can you please give me the answers of activity 14.3 from NCERT book (page 191) chapter 14 and its reason. Please make it as quick as possible!!!!!!