Physics
Why does ice covered in sawdust not melt quickly ?

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

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Physics
A balloon filled with hydrogen will

Reach a particular height and start coming down
Burst after reaching some height
Continue going upwards uninterrupted
Reach a particular height and remain floating

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