Helium is added to the oxygen supply of deep sea divers because it is _________
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On the basis of distribution, resources can be classified into ____________?
Weight of an object on the moon is ............ the weight of the object on earth.
"Tsunami" is the name given to which of the following?
A __________ thread is actually stronger than a steel wire.
Which of the following trees shed their leaves once in a year?
The Tropic of ____________ passes almost halfway through India.
To which habitat is the turtle Petri adapted?