They are given this name in seismology because they are the fastest travelling of the seismic body waves released by an earthquake.
Because they are the fastest, they are detected by seismometer stations first. Hence P for primary wave.
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That is called atmosphere.That is called atmosphere.That is called atmosphere.That is called atmosphere.
It is called a frustum.
They are called banco.
They are called ANSA
It is called a crater