- (A) Air
- (B) Sand
- (C) Vacuum
- (D) Water
_______ is considered the largest glacier of Pakistan.
March 18, 2026
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- (A) Siachen Glacier
- (B) Tirich Mir Glacier
- (C) Biafo Glacier
- (D) Hispar Glacier
Sound cannot travel through:
Sound cannot travel through:
Sound cannot travel through a vacuum. As a mechanical wave, sound requires a material medium—such as solids, liquids, or gases—to propagate, meaning it needs particles to vibrate. Because a vacuum is an empty space devoid of matter, it cannot transmit sound waves.
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