defenitions based on Waves unit
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| Wave | a repeating disturbance or movement that transfers energy through matter or space
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| Medium | the matter that waves travel through
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| Transverse | matter in the medium moves back and forth at right angles to the direction that the wave travels
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| Compressional Wave | matter moves back and forth along the same direction that the wave travels, have a rarefaction and compression
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| Seismic Waves | when earths crust shifts or bends, the breaking crust vibrates carrying energy outward
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| Crests | high points of a wave
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| Trough | low points of a wave
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| Rarefaction | less dense region of the wave
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| Amplitude | the height of the wave
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| Frequency | the number of wavelengths that pass a fixed point each second
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| Period | the amount of time it takes one wavelength to pass a point
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| Wave Speed | wave speed=frequency(HZ) * wavelength(m)
v=f*/\
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