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 light by impurities in sea water
Reflection of blue sky by sea water

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Physics
Ice is packed in saw dust because

Saw dust does not stick to the ice.
Saw dust is a good conductor of heat.
Saw dust will not get melted easily.
Saw dust is poor conductor of heat.

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Physics
Skating on ice is possible because

Ice is cold
The pressure on the ice due to skate raises its melting point
The surface of ice is smooth
The pressure on the ice due to skate melts the ice by lowering its melting point forming a thin film of water

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