How does clouds form
Water evaporates from ponds, lakes, rivers and oceans into the atmosphere. This is in vapour form and called water vapour. The water vapour rises to higher altitudes. The air pressure at these altitudes are low. As a result the water vapour expands and cools.
Why does earth rotate
There are many theories prevelant among the scientific community about the origin of the earth and the earth's rotation. One of the theory suggests that solar system, initially was a rotating cloud of dust, rocks, and gases. This was a result of the Big Bang. As time passed by, small rocks, due to gravitaional pull, combined to become bigger bodies. Due to their different masses and velocity each of them started to orbit in their own path (orbit).
Why does ice float on water
Water molecules are formed when two atoms of hydrogen bond covalently with an atom of oxygen. Hence their molecular formula is H2O. Water is a polar molecule. The density of water is 1 gram/cubic cm. The density of ice is 0.931 gm/cubic cm. This difference in the densities of both is due to the fact that, the structure of bonding between hydrogen and oxygen is different.
How to make a website
In order to make a website, two things are needed. One is the domain and other a website host.
What is GDP
GDP stands for Gross National Product. It is the market value of all final goods and services made within a country in a year. GDP is a measure of country's economic performance. It is used as a primary indicator to guage the health of a country's economy.