Physics
The blue colour of water in the sea is due to

Reflection of blue light by impurities in sea water
Reflection of blue sky by sea water
Absorption of other colours except blue by water molecules
Scattering of blue light by water molecules

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Physics
A drop of liquid assumes spherical shape because:

Intermolecular forces are strong in liquids
A sphere has the least surface area for a given volume
A sphere has the largest surface area for a given volume
Inter molecular forces are weak in liquids

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