Related by context. Frequent words. (Click for all words.) 60 tropopause 53 temperature gradients 52 methane CH4 51 upper troposphere 51 carbonate minerals 51 lithosphere 51 temperature gradient 51 exosphere 51 carbon dioxide concentrations 50 polar caps 50 atmospheric CO 50 icecap 49 polar craters 49 EROI 49 forcings 49 isotope ratios 49 icecaps 49 unobservable 49 poleward 48 extrasolar 48 landmasses 48 earth crust 48 aerosol particles 48 Relative humidity 48 noble gases 48 atmospheric pollutants 48 atmospheric methane 48 Oort cloud 48 tropospheric 48 earths 48 logarithmic scale 48 troposphere 48 glacial melt 48 WASP #b 47 megathrust 47 magma chamber 47 oxygen isotope 47 solar irradiance 47 lunar craters 47 albedo 47 obliquity 47 Tibetan Plateau 47 isotopic composition 47 mesosphere 47 latitudinal 47 celestial equator 47 hydrologic cycle 47 oC 47 polar icecaps 47 aragonite 47 glaciers melt 47 atmospheric CO2 47 infrared wavelength 47 water vapor 47 gaseous planets 47 geoid 47 martian atmosphere 47 co2 47 radiative forcing 46 icy moons 46 thawing permafrost 46 mid latitudes 46 tectonic fault 46 elliptical orbits 46 icy crust 46 -# degrees Fahrenheit [002] 46 volcanic vents 46 CO2 equivalents 46 perihelion 46 reactive nitrogen 46 adiabatic 46 lavas 46 polar vortex 46 continental crust 46 nitrogen deposition 46 erosional 46 atmospheric CO2 concentrations 46 ocean ridges 46 interglacial period 46 z = 46 undersea volcanoes 46 Lava flows 45 oxygen isotopes 45 potent greenhouse gas 45 Martian rocks 45 lunar soil 45 Oort Cloud 45 heliopause 45 emit CO2 45 Nitrogen oxides 45 elemental composition 45 greenhouse gases GHGs 45 anthropogenic 45 Martian equator 45 Melting glaciers 45 heavily cratered 45 CO -2 45 null hypothesis 45 atmospheric concentrations 45 gyres 45 degrees Fahrenheit warmer