A spring scale measures weight. some even use them to measure the weight of fish
Sound wave is gathered by Pinna ; which is outer ear !!
So C is your answer !!
The answer is that the pebbles turn into sand
Noble gases already have a full outer valence shell...whcih can only hold a maximum of 8 electrons. since the outer shell is filled, it doesn't have any empty electron spaces to form chemical bonds with other elements
