Physics
Why does the sea appear blue in colour?

Scattering of the sunlight by water molecules
Refraction of the sun light
Interference of the sun light from water surface
Reflection of the sun light from water surface

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Physics
Which one of the following statements with regard to Jet stream, an upper level tropospheric wave, is not correct?

It follows the wave path near the tropopause at elevations of 8 km to 15 km.
It is narrow band of high-velocity wind.
In summer, the polar front jet achieves its maximum force.
Jet streams are typically continuous over long distances.

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