Glaciers (image) Penn State Share Print E-Mail Caption Glaciers and lava flows, east Greenland. The layered rocks in the high peaks formed when the Iceland hot spot broke through after passing beneath Greenland. The main ice sheet is visible in the distance. Credit Richard Alley, Penn State Usage Restrictions Non commercial use only Share Print E-Mail 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.