volcanic crater, plume, volcano, rock outcrop, ejecta, lava, syrtis major, caldera, lunar crater, fireball, volcanic rock, stratovolcano, fissure, meteoroid, scarps, planitia, comet, eruption, nyiragongo, asteroid, gullies, meteor, moonlet, spherules, fumaroles, boulders, sinkhole, seracs, cumulus cloud, milky way galaxy, meteorite, pyroclastic, icecap, hypocenter, oort cloud, debris, rocks, volcanic eruption, lapilli, andromeda galaxy, ravine, betelgeuse, exosphere, nebula, jarosite, glacier, lassen peak, magma, rockslide, horsehead nebula, bolide, canyon, crustal plate, zodiacal light, basalt, outcropping, moonscape, interplanetary dust, fumarole, mushroom cloud, hummocks, mesosphere, igneous rock, tumulus, martian, large magellanic cloud, nubian desert, stalactite, popocatepetl, hillside, crust, massif, mountainside, cavern, snowfield, wreckage, graben, mount asama, geysers, galeras, supernova, tephra, rockface, neutron star, crevasse, jovian, mt etna, icefield, cosmic microwave background, cenote, earthwards, sand dune, metamorphic rock, planetary nebula, photosphere, scoria, pallasite, airglow, esker, moon, heliosphere, chromosphere, craters, mound, auditorium, square, amphitheater, dome, globe, lagoon, lake, chimney, horseshoe, rink, cirque, hall, pit, pool, bay, pore, conidial, contoured, elliptical, ridged, circular, crystallite, karstic, crystal, dendritic, dune, geosynclinal, hummocky, infilled, keratotic, macroscopic, oval, periglacial, puddle

collector

aristarchus, caldera, collector, copernicus, crater lake national park, dead, fire pit, lunar crater, maar

cleft, constellation, crack, crevice, depression, natural depression, scissure

vent