On November 11, 2018 a loud, rumbling hum was heard all around the world. From places like Canada and Hawaii to Kenya and Chile, everyone was wondering what this noise was. Was it an alien invasion? The end of the Earth? Well, it was quite the opposite. It was the cry of an undersea volcano, taking shape on the ocean floor. So, what are underwater volcanoes? How do they form? What caused the humming sound? Let's explore these questions in this article. Keep reading to find out! Underwater Volcanoes Underwater volcanoes, also called submarine volcanoes , are volcanoes that form on the ocean...