Horseshoe-shaped island formed by volcano 4,000yrs ago: Study
Antarctica's horseshoe-shaped Deception Island was formed by a volcanic eruption on the continent around 4,000 years ago, according to a study. The eruption caused the upper part of the volcano to collapse suddenly, creating a depression nearly 10-km wide. It was previously believed that the volcanic eruption event took place as far back as 8,300 years ago.