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Line 6:
Line 6: − − An [[earthquake]] is (usually) a longitudinal wave in the surface of the earth, and while the motion back and forth can be measured, their strength is usually expressed on the [[Richter Scale]].
Not to do with subject matter
Sound waves can be expressed as a difference in pressure between their peak [[compression]]s and [[rarefaction]]s, or, more practically, by their loudness or ''[[sound pressure level]]''.
Sound waves can be expressed as a difference in pressure between their peak [[compression]]s and [[rarefaction]]s, or, more practically, by their loudness or ''[[sound pressure level]]''.