Reading Passage
During the global lockdowns of 2020, international shipping activity was drastically reduced, leading to an unexpected transformation beneath the ocean’s surface. With fewer vessels crossing the seas, underwater noise pollution fell to unprecedented levels, allowing natural marine sounds to re-emerge. As a result, the ocean—once dominated by mechanical hums—became filled with the acoustic signals of marine life, revealing a thriving soundscape that had long been masked by human activity. This phenomenon challenged the long-held belief that the ocean was silent, a perception that has since been radically transformed through advances in acoustic technology and marine research.
Question 1
The passage mainly describes:
Question 2
What caused underwater sounds to become more noticeable?
Question 3
The phrase “long-held belief” refers to: