Rootless Cones: Unique Volcanic Structures Without Lava These formations resemble volcanic craters, but there's no lava…
Rootless Cones: Unique Volcanic Structures Without Lava
These formations resemble volcanic craters, but there's no lava involved.
The photo shows rootless cones, or rootless craters, on the shores of Lake Mývatn in northern Iceland. These unusual structures are often found in regions of active volcanism. They form due to steam explosions when hot lava flowing underground encounters subterranean water reservoirs, ice, or water-saturated rock layers. The sudden evaporation of water causes a violent release of steam. This steam, mixed with volcanic gases, breaks through layers of tephra deposits left by previous eruptions, creating these distinctive craters.
Interestingly, numerous rootless cones are found not only on Earth but also on Mars. In the volcanic regions of the Red Planet, their numbers reach into the thousands.
