Question
Explain why a truck or a motor bus has much wider tyres?
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How do marine organisms receive continuous supply of nutrients?
When a sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound production remains the same. Do you hear echo sound on a hotter day?
If any explosion takes place at the bottom of a lake, what type of shock waves in water will take place?
What are infrasonic waves? Name two animals which produce infrasonic waves.