Mowjadaha biyaha

As a water wave moves forward, each bit of water is moving up and down (oscillating), not forward. Water waves are transverse waves: the direction of oscillation is 90° to the direction of energy transfer. The amplitude of a water wave is the greatest distance water moves above and below the rest position. Waves that pass through each other can ‘add up’ or ‘cancel out’; this is called wave superposition. Water waves reflect from hard barriers, obeying the laws of reflection.