Related by context. Frequent words. (Click for all words.) 56 Ethiopian highlands 54 interplanetary dust 52 Volcano erupts 51 Lava flows 51 Sahara Desert 51 hardened lava 51 Mauritania Mali Niger 50 Gilf al Kebir 50 Fighting rages 50 arid deserts 50 Zagros Mountains 50 equatorial 50 Fighting erupts 50 tropopause 49 Omo River 49 arid desert 49 Namib Desert 48 Abubaker Kaki 48 Great Rift Valley 48 KHARTOUM AFP 48 arid 48 Landslide kills 48 Cabeus crater 48 Nyiragongo 47 Sahara desert 47 permanently shadowed crater 47 Ferry sinks 47 craton 47 Sudan 47 Amazonian jungle 47 arid plains 47 Paloich 47 southern 47 Mortar bombs 47 asteroids comets 47 desert 47 Strong quake jolts 47 Lop Nur 46 northern 46 Gusev crater 46 scrublands 46 Kapoeta 46 Oort cloud 46 heavily cratered 46 Quake jolts 46 dense rainforest 46 meteoroids 46 Mali Senegal 46 interstellar dust 46 Saharan desert 46 Mauritania Niger 45 Seasonal rains 45 Khor Abeche 45 Shangil Tobaya 45 mesosphere 45 Quake rattles 45 Meroe 45 Orientale Province 45 Quake shakes 45 cometary 45 Aksum 45 Niger Senegal 45 collisional 45 Thar Desert 45 craggy mountains 45 Oort Cloud 45 blinding sandstorm 45 pyroclastic 45 Ghadames 45 desolate landscape 45 Lokichoggio 45 Moderate quake 45 meteoroid 45 southwestern Baluchistan 45 Jupiter moon Io 44 Markaba 44 fertile plains 44 Gobi Desert 44 bolide 44 Boat sinks 44 Swift Tuttle 44 grassy plains 44 acrid black 44 volcanic lava 44 Djibouti Eritrea 44 temperate forests 44 Chicxulub crater 44 Tawila 44 Charred bodies 44 Semliki 44 sedimentary layers 44 Valles Marineris 44 Saharan dust 44 Earthquake shakes 44 meteorites 44 barren desert 44 Rover Opportunity 43 Altai Mountains 43 barren hills 43 Mauritania Mali 43 crater