Why is water essential for life?
Water is essential for life because
(i) all life processes that take place in the cells require water medium.
(ii) water is needed for transportation of substances from one part of the body to the other in a dissolved form.
(iii) All the reactions in the body or within the cells occur between substances that are dissolved in water.
You have seen weather reports on television and in newspapers. How do you think we are able to predict the weather?
How is our atmosphere different from the atmosphere on Venus and Mars?
What causes winds?
How does the atmosphere act as a blanket?
