Answer :
Answer:
The sentence in parentheses means:
D. The tremors from multiple little earthquakes cause energetic beats much like musical harmonies do.
Explanation:
They are called harmonic tremors, perhaps because of their constant release of energy, like one long song played underground.
The sentence above is comparing the small earthquakes that happen below volcanoes to a song. We can think of music as a harmonic release of energy. The energy (the notes and chords) are released in a way that is constant, understandable, and even predictable. The same way, those little tremors are also releasing energy in a constant manner. In that sense, they can be compared to a song, to its beat, its rhythm.