Frozen lava flows
© NASA
While orbiting over Europe, an astronaut on the International Space Station (ISS) snapped this view of the Nemrut volcano in Turkey. The eastern side of Lake Nemrut is solidified lava flows from past eruptions, taking up half of the volcano’s caldera. The volcano last erupted in 1650 BCE, leaving behind ‘pressure ridges’ of cooled and hardened lava.