Soru

### The Source of the Earth's Hum

Earth is constantly vibrating at extremely low frequencies, a phenomenon known as the "microseismic hum." This hum persists even in the absence of earthquakes. Two scientists present competing hypotheses regarding the primary source of this hum.

Scientist 1
The Earth's hum is driven entirely by ocean wave interactions. When ocean waves of similar frequencies travel in opposite directions, they collide. This collision generates standing pressure waves that do not decay with depth. These pressure waves propagate through the water column and strike the seafloor, generating seismic waves (oceanic microseisms) that travel through the Earth's crust. Because ocean wave activity is continuous and global, this mechanism accounts for the uninterrupted nature of the Earth's hum.

Scientist 2
The hum is caused by atmospheric dynamics, not oceanic activity. Turbulence in the atmosphere, wind shear, and atmospheric gravity waves exert varying vertical pressures directly on the continents. These atmospheric pressure fluctuations couple with the solid Earth, transferring acoustic energy directly into the crust. The hum is most intense over landmasses where atmospheric storm systems are active, demonstrating that the primary driver is atmospheric force rather than deep-ocean wave interactions.

Which of the following statements best summarizes Scientist 2's central hypothesis regarding the origin of the Earth's hum?