Related by context. Frequent words. (Click for all words.) 50 steep ravines 50 craters 49 gouged 48 trench dug 48 crater 48 Armoured vehicles 48 freshly dug 47 craggy mountains 46 rock outcrop 46 trenches dug 46 bomb craters 45 Glass shards 45 NASA Opportunity rover 45 Martian landscape 45 hardened lava 45 lunar soil 45 Martian dust 44 polar craters 44 Artillery shells 44 boulder strewn 44 Rocket propelled grenades 44 Gusev crater 44 deep gorges 44 Martian rocks 44 comet nucleus 44 hillocks 43 sandstone cliffs 43 shellfire 43 rugged cliffs 43 heavily cratered 43 Freighters #-#-# 43 granite boulders 43 dry riverbeds 43 sniper nests 43 deep ravines 42 escarpments 42 earth 42 Blood stained 42 earthen barrier 42 microscopic imager 42 outer crust 42 rock outcrops 42 lava tubes 42 meteoroids 42 Vast tracts 41 gaseous planets 41 martian surface 41 streambeds 41 gouge 41 dug trenches 41 dense brush 41 emplacements 41 boulders 41 blinding dust 41 towering pine trees 41 clods 41 spherules 41 pock 41 NASA Spirit rover 41 desolate landscape 41 armored bulldozer 41 Debris littered 41 rover Spirit 41 gash 41 hardpan 41 moonscapes 41 dry riverbed 41 volcanic rock 40 loess 40 Rover Opportunity 40 volcanic vents 40 mudbrick 40 armored bulldozers 40 Entire towns 40 martian soil 40 revetments 40 helicopters clattered overhead 40 rocks 40 earthen wall 40 corrugated iron roofs 40 heavily forested hills 40 bullets whizzed 40 meteoroid 40 pebbly 40 makeshift stretcher 40 jagged mountains 40 Dugit 40 gaping crater 40 orbiting Hubble Space Telescope 40 dug mass graves 40 rocky slope 40 grassy plains 40 Valles Marineris 40 lunar craters 40 gullies 39 bulldozers 39 Opportunity rover 39 rocky ledges 39 Endurance Crater 39 rock outcropping 39 moonlets