what determine the characteristics of waves?
['Crest = Highest point of the wave.', 'Trough = Lowest point of the wave.', 'Wavelength = Distance from one crest/trough to the next (m)', 'Wave Height = Height from trough to crest (m)', 'Wave steepness = ratio of wave height to wavelength.', 'Amplitude = distance from the centre of wave to the bottom of the trough (m)']