eruption, volcanic eruption, lava, stratovolcano, galeras, mayon, nyiragongo, vulcanologist, caldera, crater, fumaroles, magma, volcanic crater, mount asama, volcanology, mount etna, hekla, glacier, lahar, lassen peak, mt etna, ash, pinatubo, popocatepetl, plume, mount pinatubo, mudflow, mount vesuvius, mountain, quakes, semeru, ojos del salado, seismicity, volcanism, fumarole, earthquakes, geysers, solidum, pyroclastic, seamount, icecap, iztaccihuatl, temblor, mauna loa, hot springs, tsunamis, syrtis major, tropopause, tremor, huascaran, el misti, krakatoa, tambora, rockslide, volcanic rock, san andreas fault, observatory, seafloor, crustal plate, cave, ridge, landslides, mudslide, aurora, andreanof islands, tephra, slopes, meteor shower, basalt, mount fuji, typhoon, chimborazo, iceland, icefield, krakatau, plate tectonics, bonin islands, meteoroids, comet, tectonic, fireball, aftershock, pumice, pico de orizaba, old faithful, nanda devi, mountainside, auklet, archipelago, jan mayen, alpenglow, trembler, permafrost, meteor, bernese alps, thunderhead, massifs, coral reef, tunguska, plinian, undersea, lightnings, volcanoes, geyser, dune, billboard, skyscraper, volcanos, waterfall, cairn, dam, lighthouse, stadium, craters, elephant, iceberg

cameroon, citlaltepetl, colima, cotacachi, cotopaxi, demavend, etna, fuego, fuji, fuji-san, fujiyama, guallatiri, huainaputina, klyuchevskaya, krakatao, lascar, mauna kea, mount orizaba, mount saint helens, mount st. helens, mt. st. helens, mt. vesuvius, mt orizaba, nevado de colima, pasto, purace, sangay, tupungatito, vesuvius, volcan de colima

asama, caldera, cameroon, citlaltepetl, colima, cotacachi, cotopaxi, crater, crater lake national park, dead, demavend, dormancy, dormant, el misti, etna, extinct, extinction, fuego, fuji, fuji-san, fujinoyama, fujiyama, galeras, guallatiri, haleakala national park, huainaputina, iwo jima, klyuchevskaya, lahar, lascar, mauna kea, mauna loa, mount asama, mount etna, mount fuji, mount orizaba, mount pinatubo, mount saint helens, mount st. helens, mount vesuvius, mt. st. helens, mt. vesuvius, mt etna, mt orizaba, nevado de colima, nyamuragira, nyiragongo, pasto, pico de orizaba, pinatubo, purace, saba, sangay, spew, tupungatito, vesuvius, volcanic crater, volcan de colima

cleft, crack, crevice, fissure, mount, scissure

vent