Related by context. Frequent words. (Click for all words.) 67 Chicxulub 60 undersea volcanoes 56 Yucatán Peninsula 56 Valles Marineris 56 hydrothermal vent 55 Puerto Angel 55 mud volcanoes 54 landmasses 54 Yucatan Peninsula 53 heavily cratered 53 crater 52 scarps 52 extinct volcanoes 52 meteoroid 52 Oort Cloud 52 lava tubes 52 supercontinent 52 Olmecs 52 volcanic plume 52 Meteor Crater 51 erosional 51 foraminifera 51 Cabeus crater 51 tropopause 51 undersea volcano 51 megathrust 51 spherules 51 Paleocene 51 Celebes Sea 50 Cabo Catoche 50 Alaskan coastline 50 Cabeus 50 underwater volcanoes 50 equatorial waters 50 asteroid 50 Petermann Glacier 50 polar vortex 50 RQ# 50 Yucatan 50 volcanically active 50 ejecta 50 Mexico Yucatan peninsula 49 volcanic vents 49 volcanic vent 49 gyre 49 icy moons 49 pyroclastic flow 49 basaltic 49 Russia Kamchatka Peninsula 49 hydrothermal breccia 49 lava flows 49 oceanic crust 49 underwater plume 49 Saharan dust 49 coronal mass ejection 49 undersea plumes 49 galaxy NGC 49 Cascadia Subduction Zone 49 ocean ridges 49 stromatolites 49 coral formations 49 Tharsis 49 NASA MODIS Image 48 Olympus Mons 48 moonlets 48 continental crust 48 tar mats 48 Endurance Crater 48 meteorite impacts 48 marine sediments 48 volcanic islands 48 seamount 48 Lake Atitlan 48 Opportunity rover 48 Meridiani 48 impactors 48 Galileo spacecraft 48 volcanic crater 48 cenote 48 meteor 48 Martian equator 48 igneous rocks 48 Eagle Nebula 48 Gondwanaland 48 heliosheath 48 Moderate Resolution 48 volcanism 48 Loop Current 48 geologically active 48 lithosphere 48 pyroclastic 48 Tidal waves 48 Haumea 48 Strong quake jolts 47 Kuiper belt 47 comet nucleus 47 Typhoon Songda 47 WASP #b 47 martian atmosphere 47 hardened lava 47 Hurricane Norbert