Related by context. Frequent words. (Click for all words.) 63 glaciers 60 polar ice 60 mountain glaciers 60 oceans 58 melting permafrost 57 melting glaciers 57 Greenland ice 56 Antarctic ice 56 glacial ice 56 glacier 54 permafrost 53 Antarctica 53 meltwater 52 polar regions 52 glaciation 51 atmospheric CO2 51 tropics 51 plate tectonics 51 Glaciers 51 melting ice 50 biosphere 50 glacial lakes 50 Arctic Ocean 50 Antarctic Ice 50 atmospheric carbon dioxide 50 melting polar 50 greenhouse warming 50 Melting ice 49 melting 49 ozone layer 49 volcanoes 48 earths 48 protective ozone layer 48 ice melts 48 volcanic eruptions 48 stalagmites 48 ocean 48 arctic 48 glacial 48 volcanism 47 mid latitudes 47 Little Ice Age 47 acidification 47 water vapor 47 tundra 47 Earth crust 47 earth crust 47 polar 47 landforms 47 atmospheric circulation 47 icebergs 47 ozone depletion 46 Antarctic Peninsula 46 ice 46 mountain ranges 46 planet 46 moon Europa 46 refreezing 46 coral reefs 46 floods droughts 46 ocean currents 46 atmospheric concentrations 46 Antarctic 46 glacial lake 46 Arctic Circle 46 Arctic 45 sunspot activity 45 global warming 45 Global Warming 45 subtropics 45 tectonics 45 freshwater lakes 45 snow melt 45 greenhouse gas concentrations 45 Tibetan Plateau 45 ecosystems 45 albedo 45 snowpacks 45 troposphere 44 lowlands 44 lava flows 44 Arctic tundra 44 latitudes 44 geysers 44 mass extinctions 44 manmade 44 Serreze 44 peat bogs 44 aridity 44 Nature Geoscience 44 rainforests 44 lakebed 44 equator 44 magma 44 manmade global warming 44 Greenland 44 Martian surface 44 journal Geophysical Research 44 coral bleaching 44 lakes 44 subduction zones