Related by context. Frequent words. (Click for all words.) 57 lithosphere 57 Valles Marineris 56 icy crust 56 oceanic crust 54 magma chamber 54 continental crust 54 crustal 53 ejecta 53 ionised 53 Saturn moon Enceladus 52 Martian equator 52 basaltic 52 lava tubes 52 protoplanetary disk 52 lavas 52 hydrothermal breccia 52 subsurface 52 ionized gas 52 Meridiani 51 Endurance Crater 51 silicates 51 hydrothermally altered 51 volcanic vents 51 syncline 51 stalactite 51 mud volcanoes 50 graben 50 solar nebula 50 Oort Cloud 50 torus 50 Olympus Mons 50 copper oxides 50 lunar soil 50 earth crust 50 magmas 50 sedimentary rock 50 polar vortex 50 lunar poles 50 planetesimals 50 moonlets 50 surficial 50 weakly mineralized 50 basalts 50 methane hydrates 49 igneous rock 49 clasts 49 lava flows 49 magmatic 49 pyroclastic 49 accretion disk 49 temperature gradient 49 Lake Vostok 49 hydrothermal vent 49 volcanic vent 49 glacial till 49 Martian surface 48 hydrothermal activity 48 planetary nebulae 48 scarps 48 moon Europa 48 desorption 48 spherules 48 breccia pipe 48 Saturn moons 48 olivine 48 Earth crust 48 graphitic 48 Saturn rings 48 GPa 48 Cabeus 48 rock outcrop 48 polar caps 48 carbonaceous 48 talus 48 jasperoid 48 mudstone 48 supercontinent 48 Saturn moon 48 kimberlitic 48 electron density 48 overlying 48 stromatolites 48 magma 48 calcite 48 sulphates 48 nucleation 48 breccia pipes 48 Enceladus 48 comet nucleus 48 Meridiani Planum 48 calcrete 47 igneous rocks 47 regolith 47 landmasses 47 sediments 47 peridotite 47 crystal lattice 47 embayment 47 marine sediments 47 overlie 47 volcanically active