Related by context. Frequent words. (Click for all words.) 56 inhospitable terrain 53 harshest environments 52 inhospitable 52 unforgiving terrain 51 Polar Regions 50 driest continent 49 temperate forests 49 climatic conditions 49 arid regions 48 arid desert 48 biologically diverse 47 frequent droughts 47 biodiversity hotspots 47 cold climates 47 subtropical climate 47 biodiverse 47 climates 46 subtropical regions 46 arid 46 Migrating birds 46 breathtaking landscapes 46 harsh environments 46 prolonged droughts 45 arid lands 45 extremophiles 45 planet 45 habitable planets 45 endangered mammals 44 geological formations 44 lifeforms 43 terrains 43 Emperor penguins 43 habitats 43 Giant pandas 43 vast expanses 43 creatures 43 temperate zones 43 wildernesses 42 seismically active regions 42 environments 42 ecosystems 42 Arctic Circle 42 drylands 42 Antarctica 42 temperate climate 42 temperate 42 river deltas 42 biome 42 aridity 42 powerful particle accelerator 42 icecaps 41 micro climates 41 climatically 41 vast expanse 41 temperate climates 41 polar regions 41 deserts 41 subarctic 41 majestic creatures 41 rugged mountainous terrain 41 ecologies 41 hydrothermal vent 41 arctic 41 habitable planet 40 fertile soils 40 harsh winters 40 microclimate 40 megafauna 40 desert 40 loneliest 40 adaptable 40 floods droughts 40 habitable zones 40 tropical climates 40 biosphere 40 warmer drier 40 bipeds 39 treacherous seas 39 interplanetary spacecraft 39 fertile valleys 39 semiarid 39 intelligent beings 39 humans 39 emperor penguins 39 semi arid 39 frigid 39 Antartica 39 Qinghai Tibet Plateau 39 corrosive environments 39 tropics 39 climatic 39 spectacular scenery 39 searing heat 39 Martian landscape 39 humankind 39 habitable 39 volcanically active 39 hardiest 39 geologically active 39 spacecrafts 39 equatorial regions