Physics
Why does ice covered in sawdust not melt quickly ?

Sawdust does not allow the air to touch the ice
Sawdust is good conductor of heat
Sawdust is a bad conductor of heat
The water is absorbed by sawdust

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Physics
A hydrogen balloon floats up because of

The pressure inside the balloon is more than the pressure outside it
Air pressure decreases with decrease in weight
Weight of the balloon is less than the weight of air displaced by it.
Air pressure decreases with decrease in height

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