어학 공부 자료/400 순수과학1 450: Volcanic activity In a recent geological study, researchers discovered evidence that significant volcanic activity took place in the northern hemisphere approximately 200,000 years ago. This activity was responsible for the eruption of vast amounts of molten lava, which eventually began to solidify as they cooled. Over time, this once liquid rock transformed into an expansive plateau, covering thousands of square.. 2023. 8. 16. 이전 1 다음