Related by context. Frequent words. (Click for all words.) 51 Peru 47 Antarctica 46 Amazon basin 45 glacial retreat 45 sediment cores 45 Earthwatch Institute 45 Andes Mountains 44 Earthwatch 43 Antartica 43 Galapagos islands 43 tropics 43 Polar Regions 43 equatorial 42 highlands 42 atmospheric chemistry 42 Antarctic 42 Andes 41 lake sediments 41 Patagonia 41 glaciers 41 deforestation 41 climate 41 Guatamala 41 Amazon Rainforest 41 southern highlands 41 Peruvian Andes 40 fieldwork 40 mountain glaciers 40 Patagonian 40 tropical forests 39 glaciologist 39 IODP 39 geological 39 tropical forest 39 geology 39 marine sediments 39 biogeography 39 Greenland 39 central highlands 39 temperate forests 39 expeditions 39 Chile 39 ozone depletion 39 rainforest 39 Galápagos 39 volcanoes 39 Mesoamerica 39 subarctic 39 melting glacier 39 climate change 39 coffee plantations 38 glaciologists 38 biogeochemistry 38 glacier 38 Antarctic peninsula 38 biome 38 equator 38 mycology 38 Andes mountains 38 Galapagos Islands 38 Amazonia 38 Beringia 38 Chaco Canyon 38 Mongolia 38 lichens 38 geologically active 38 Guatemala 38 geomorphology 38 Manaus Brazil 37 geologic 37 remote sensing 37 Costa Rica 37 Geochemistry 37 cryosphere 37 tropical rainforest 37 expedition 37 hydrothermal vent 37 rainforests 37 Cerrado 37 radiocarbon dating 37 indigenous peoples 37 palaeontology 37 glacial melt 37 Peruvian Amazon 37 journal Geology 37 nitrogen fixation 37 Cuzco Peru 37 microfossils 37 atmospheric sciences 37 biodiversity 37 temperate zones 37 Alejandro Toledo 37 Biological Station 37 equatorial regions 37 Bolivia 37 Lake Atitlan 37 glacier melt 37 glacial melting 37 Fulbright Fellowship 37 Weddell Sea 37 Amazon rainforest