Related by context. Frequent words. (Click for all words.) 61 glacial ice 56 lithosphere 55 mid latitudes 55 permafrost 55 glacier 54 continental crust 54 interglacial period 53 lake sediments 53 Tibetan Plateau 53 polar vortex 53 isotope ratios 53 receding glaciers 53 glaciated 53 poleward 53 Siberian permafrost 53 polar caps 52 retreating glaciers 52 glaciers 52 marine sediments 52 glacial till 52 glacial retreat 52 Weddell Sea 52 heavily cratered 52 Dry Valleys 51 GPa 51 glacial melting 51 melting glacier 51 coniferous forests 51 mesosphere 51 timberline 51 deglaciation 50 glacial melt 50 hydrothermal activity 50 subarctic 50 Greenland ice 50 hardened lava 50 aragonite 50 Meridiani 50 scarps 50 atmospheric methane 50 temperature gradient 50 Greenland glaciers 50 glaciation 50 oceanic crust 50 Lake Vostok 50 Arctic permafrost 50 -# degrees Fahrenheit [002] 50 glaciers melting 50 Ross Ice Shelf 50 albedo 50 snowline 50 clasts 50 talus 49 Olympus Mons 49 Valles Marineris 49 treeline 49 Antarctic ice 49 igneous rocks 49 Klamath Mountains 49 mudstone 49 thawing permafrost 49 olivine 49 foraminifera 49 Rignot 49 stalagmite 49 cryosphere 49 mountain glaciers 49 Qinghai Tibet Plateau 49 NSIDC 49 isotopic composition 49 Antarctic peninsula 49 lavas 48 Petermann Glacier 48 basaltic 48 temperate forests 48 Greenland Ice 48 dense brush 48 sedimentary rock 48 icy crust 48 ridge 48 Early Cretaceous 48 glacier melt 48 elemental composition 48 radiocarbon dated 48 metamorphic rocks 48 Permafrost 48 Melting glaciers 48 tropospheric 48 moraines 48 snow melt 48 Quaternary 48 Martian equator 48 lunar poles 48 elevations 48 equatorial Pacific Ocean 47 lava flowing 47 hydrothermally altered 47 equatorial regions 47 basalts 47 manganese oxide 47 icecap