Sound waves can be described as all of these except
a) mechanical waves
b) compression waves
c) longitudinal waves
d) electromagnetic waves

The correct answer is B. Compression Waves

Explanation:

Mechanical longitudinal waves are also called compressional or compression waves, because they produce compression and rarefaction when traveling through a medium, and pressure waves, because they produce increases and decreases in pressure. Therefor, Compression Waves is the correct answer.

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the second type of galaxy is called a barred spiral, which has a thing called a bar straddling the nucleus

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