Related by context. Frequent words. (Click for all words.) 69 lava tubes 64 volcanic crater 64 buttes 63 rock outcrops 62 volcanoes 62 Valles Marineris 62 lava flows 62 landforms 61 stalactite 61 caldera 61 sandstone cliffs 60 extinct volcano 60 Kilauea Volcano 60 steam vents 60 granite boulders 60 explosive eruptions 59 landform 59 volcanic rock 59 lahars 59 deep gorges 59 lava tube 59 volcanic 58 towering cliffs 58 hydrothermal activity 58 lava 58 rock formations 58 limestone caves 58 scarps 58 escarpments 58 stalagmites 57 lava flow 57 basalt 57 active volcanoes 57 basaltic 57 hoodoos 57 Teton Range 57 magma chamber 57 massif 57 craggy mountains 57 stalactites 56 jagged peaks 56 lavas 56 rocky outcrops 56 glacial lakes 56 hydrothermal vent 56 towering peaks 56 rock outcroppings 56 cliff dwellings 56 dormant volcano 55 Kilauea volcano 55 limestone formations 55 retreating glaciers 55 evergreen forests 55 igneous rock 55 outcroppings 55 mountain ranges 55 volcanically active 55 stromatolites 55 petroglyphs 55 ridges 55 granite peaks 55 rock outcrop 55 Burgess Shale 55 volcanic activity 54 limestone cave 54 petroglyph 54 volcanic gases 54 clasts 54 geologic 54 stalagmite 54 grassy slopes 54 volcanic eruptions 54 moraines 54 Namib Desert 54 crater 54 volcanism 54 crags 53 sedimentary rock 53 gullies 53 limestone cliffs 53 marine sediments 53 alpine lakes 53 glaciers 53 barrens 53 lichens 53 mudstone 53 pyroclastic flow 53 active volcanos 53 lush valleys 53 Mogollon Rim 52 geologic formations 52 cairns 52 mesas 52 Painted Desert 52 Martian landscape 52 calcite 52 volcanos 52 glaciated 52 Mount Etna 52 temperate forests 52 melting glacier