Iceland is superlative when it comes to contrasts. One could hike to these two places in the same day. On top is a common moss that grows in particularly wet areas. Below is Hverfell, a tephra ring formed by certain volcanic eruptions, it's all sand and gravel that rises 1400' from the ground around it and is about 3/4 of a mile across. It happens to be on the edge of Lake Myvatn, which one of us took a picture of by turning around on top of Hverfell and facing out instead of in.