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

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

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Physics
Air moves from the region where the air ________

Humidity is low to the region where the humidity is high
Pressure is low to the region where the pressure is high
Pressure is high to the region where the pressure is low
Humidity is high to the region where the humidity is low

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