Flat-topped mountains More of these mountains. They’re made of congealed lava and never had a top: this is what happens when an eruption wells up underneath a glacier. 13 May 2019 Iceland Travel ← → Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website Δ This site uses Akismet to reduce spam. Learn how your comment data is processed.