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This causes a build-up of pressure in a practice knows as subduction. In rarefaction, there's temporary decline in density of the medium. As frequency decrease (gets lower), the wavelength gets shorter. At times you will observe a graph of a sound wave that resembles a sine wave (observe below). What an awesome transformation! Instead of one wave there'll be two. You will have to pull off your oxygen mask. Volcanoes cause tsunamis when there's an eruption. There are a number of unique types of waves. This can occur when the waves travel with distinctive speeds, nor add up the exact means to one another. Clean your hair thoroughly with an excellent shampoo and use a conditioner.