What's your Zodiac Sign? Mines a Virgo and my ruling planet is Mercury, and my element is Earth. If you don't know what it is or
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D is the correct answer.
In the badly drawn diagram attached, you will find the <em>yellow</em> represents wavelength, which is the distance between identical points on consecutive waves.
The <em>green</em> represents the amplitude, which is the distance between the origin (middle) and crest/trough (top/bottom)
