Volcanic rocks
Aa lava, Pacaya, Guatemala
Volcanic rock
Lava flow
Kambhorn reflected in lagoon, Iceland
Skjaldbreidur shield volcano, Iceland
Volcanic landscape, Lanzarote, Canary Islands
Volcanic solfatara formation
Sample of basalt
Ancient lava flow, Lanzarote, Canary Islands
West Mata underwater volcano
Obsidian-rich lava flow, Tenerife
Eruption of Mount Batu Tara, August 2011
Basalt outcrop
La Tarta volcanic outcrop, Tenerife
Volcanic eruption
Tuff specimen
Tuff rock with graded bedding
Fjallaback Nature Reserve, Iceland
Solidified volcanic ash
Bozen quartz porphyry, South Tyrol, Italy
Eruption of Fuego volcano, November 2016
Agglomerate rock, polarised LM
Sample of granite
Marum volcano, Vanuatu
Quartz-feldspar porphyry
Banded gneiss
Obsidian lava
Obsidian rock
Kenyte lava
Basalt bomb
Nyiragongo volcano, Congo
Lava landscape, Canary Islands
Volcanic craters, Lanzarote
Lava flow, deep sea vent
Eruption of Momotombo volcano, February 2016
Mount Cotopaxi
Volcanic eruption, Reunion Island
Volcanic lava delta
Santiago crater lava lake, Masaya caldera, Nicaragua
Heavily weathered kimberlite
New island formed by Hunga Tonga volcano, 2017
Basaltic lava flow, New Mexico, USA
Volcanic crater
Italian medieval city on volcanic neck
Aerial near Hekla Volcano
Tangaroan volcanic eruption, artwork
Tuff
Pegmatite dike in granite
Myrdalsjokull ice cap over Katla volcano, satellite image
Volcanic landscapes in Western Iceland.
Lava
Fractured pillow lava, deep sea vent
Bedded tuff with two piles of volcanic ash
Quilatoa Lake
Limestone pavement
Limestone karst remnant
Eroded sandstone
Volcanic spatter cones
Lava tube tourist attraction, Hawaii
Igneous rocks near Arbatax, Sardinia, Italy
Giant's Causeway
Lava fields, Lanzarote, Canary Islands
Volcan de Fuego erupting at night, Guatemala
Granite on Capo Testa, Sardinia, Italy
Eldhraun lava field, Iceland
Volcanic crater lake
Biblis Patera volcanic crater, Mars
Erta Ale Volcano, Ethiopia
Diorite intruded by microgranite
Rhyolitic tuff, polarised light micrograph
Granite rock arch in mountains in Namibia
Pillow lava near Laugarvatn, Iceland
Sulphur rocks
Volcanic landscape, Lanzarote
Rock mineral crystals, polarised LM
Molten pahoehoe lava burning trees on Hawaii
Basalt pavement, Iceland
Andesite
Montana Caldereta, Lanzarote, Canary Islands
Rhyolite
Bezymianny volcano, satellite image
Pillow lava, deep sea vent
Lava flowing into ocean, Hawaii
Eroded Gibber Plain
Badlands
Lava landscape
Whakaari volcano sulphur deposits, New Zealand
Hornblende-biotite granite
Basalt columns
Sample of biotite
Banded rhyolite
Sample of pumice
Sample of andesite
Lava flow running into the sea off Hawaii
View inside Thurston lava tube on Hawaii, USA
Eruption of Stromboli, July 2014
Balsam spurge (Euphorbia balsamifera) on lava
Volcanic mud pools
Erta Ale volcano, Congo
Weathered sandstone rocks
Summit crater of Hverfjall volcano, Iceland
Rhyolite, light micrograph
Physical weathering
Weathered sandstone boulder
Banding patterns
Esja plateau, Iceland
Boiling mud pool
Granite boulders and sandy beach
Round granite boulders on coast
Weathered granitic bedrock
Black smoker hydrothermal vent
Cut and polished septarian nodule
Mineral hot springs, Iceland