Mt. Sumbing, Java (IMAGE) University of California - Berkeley Caption Mt. Sumbing, an arc volcano in Central Java, in 2016. The uplift of volcanic rock in the entire Southeast Asian island arc, starting 15 million years ago, triggered global cooling and eventually ice sheets that covered much of North America and Northern Europe 18,000 years ago, according to UC Berkeley scientists and their colleagues. Credit UC Berkeley photo by Yuem Park Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.