WHY IS THE SKY BLUE?
The blue color of the sky is due to Rayleigh scattering. As light moves through the atmosphere, most of the longer wavelengths pass straight through. Little of the red, orange and yellow light is affected by the air.
However, much of the shorter wavelength light is absorbed by the gas molecules. The absorbed blue light is then radiated in different directions. It gets scattered all around the sky. Whichever direction you look, some of this scattered blue light reaches you. Since you see the blue light from everywhere overhead, the sky looks blue.
Why is earth round?
Well not only earth all massive objects are all round in nature as round takes minimum space, Since gravity pulls toward the center of the planet or star, everything gets pulled down into a sphere. However, planets and stars are not really perfect spheres. They spin, so they bulge out a little around the equator.
Which makes it appear round
Why water is wet?
Due to presence of charge, High polarity of oxygen split the H2O in H+ and OH-
as well as Due to hydrogen bonding which makes it stick to the skin to stabilize the charge on OH- and H+
Why is fire hot?
Fire is the result of a chemical reaction (oxidation) which releases energy stored in chemical bonds. This released energy is the "heat" you feel.
As the chemical reaction releases stored energy, volatile chemicals are released, it is these hot vapors which you see and call flames. The color of the flame is an indication of the chemicals being released
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