Answer:
An earthquake is a sudden shaking movement of the surface of the earth. It is known as a quake, tremblor or tremor. Earthquakes can range in size from those that are so weak that they cannot be felt to those violent enough to toss people around and destroy whole cities. ... An earthquake is measured on Richter's scale.
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The wavelength of the third resonance of the closed organ pipe is equal to the ratio between the speed of sound and the frequency of the 3rd harmonic:

The relationship between length of a closed pipe and wavelength of the standing waves inside is:

where n is the number of the harmonic. In this case, n=3, so the length of the pipe is

Answer:
The observable universe is still huge, but it has limits. because it's most likely like an plane all round.
Explanation:
<span>Generators use the magnetic field of "Permanent Magnets"
In short, Your Answer would be Option D
Hope this helps!</span>
I think it is C. I hope I helped.