crater with gray volcanic healing clay. a hole with a prominent amorphous mass from the depths of the earth. mud and gas eruption

clay crater mud volcano eruption gas soil surface grey cracks outdoor earth nature travel geology tourism natural environment muddy liquid gray phenomenon erupting pressure volcanoes textured volcanic bubble geological sulfur lava erupt active europe destination national geography moonlike geothermal flow mineral mountain temryuk bubbling desert exploding healing clay hole prominent amorphous mass depths earth eruption russia cracked surface texture mudflow