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(Click for frequent words.) 54 Syrtis Major 54 Saturnian moons 53 Damaraland 51 Namib Desert 51 polar plateau 50 Kiruna Sweden 50 Planitia 49 Svalbard Islands 49 ° #'N 49 cryovolcanism 48 Fimmvorduhals 48 Shinmoedake 48 Shiveluch 48 Chajnantor plateau 48 Mount Unzen 48 Bramley Murton 48 El Chichon 48 Ny Ålesund 48 Ammassalik 48 airglow 47 Sarychev Peak 47 Lake Vui 47 Hekla 47 retrograde orbit 47 B#B 47 Norway Svalbard 47 Eyjafjallajokull Volcano 47 Utopia Planitia 46 Kangerlussuaq Greenland 46 Caloris Basin 46 Eridanus 46 constellation Monoceros 46 Karangetang 46 Sognefjord 46 volcano spews ash 46 ESA Envisat 46 flood basalts 46 Disko Bay 46 Grímsvötn volcano 46 Nordic Barents 46 Crozet Islands 46 Moho 46 Eyjafjallajökull glacier 46 Siberian Traps 46 katabatic winds 46 Usambara Mountains 46 Jacques Durieux 46 Nyiragongo 46 Sangihe island 46 constellation Auriga 46 Sakurajima 45 Oceanus Procellarum 45 Mariana Arc 45 volcanic plumes 45 fissure eruption 45 Iceland Eyjafjallajoekull glacier 45 Vastitas Borealis 45 Cerro Pachon 45 Rinjani 45 ° #'E 45 Namib Naukluft Park 45 Tenere 45 Svalbard Norway 45 Chaitén volcano 45 volcanic plume 45 Nankai Trough Zone 45 Magellanic 45 Apennine 45 Llaima volcano 44 deep convective clouds 44 West Fjords 44 Qaanaaq 44 Svalbard archipelago 44 Oslofjord 44 constellation Cetus 44 Ed Laguerta 44 Mount Karthala 44 twin Voyager spacecraft 44 Punta Sur 44 basaltic 44 Mount Karangetang 44 Tuamotu Archipelago 44 Vatnajökull 44 Muchachos Observatory 44 Arusha Kilimanjaro 44 Kiel Canal 44 Polar Regions 44 Vatnajokull 44 Mount Semeru 44 Eyjafjallajökull erupted 44 Via Australis 44 Ojos del Salado 44 Mount Soputan 44 volcanic tuff 44 Agulhas Current 44 Oldonyo Lengai 44 Ruwenzori Mountains 44 Grímsvötn 44 Mount Kelut 44 Curiosity rover 43 elliptical orbits 43 Varanger 43 Helix Nebula 43 Cordillera Blanca 43 Stromboli volcano 43 Karthala 43 Capricornus 43 Prydz Bay 43 Fossae 43 Kasei Valles 43 Halema'uma'u 43 Chaiten Volcano 43 Hellas Planitia 43 Norwegian polar explorer 43 Patagonian Ice 43 constellation Pisces 43 Comet Hartley 2 43 equatorial 43 Westfjords 43 olivine mineral 43 Volcano erupts 43 volcanic basalt 43 Volcano eruption 43 Icecap 43 Alboran 43 Kirishima range 42 Nadym 42 magnetotail 42 Kasatochi volcano 42 constellation Hercules 42 midlatitudes 42 Dumont d'Urville station 42 equatorial latitudes 42 fiords 42 volcanic activity 42 constellation Cepheus 42 Hellas Basin 42 Changcheng Station 42 Ol Lengai 42 NASA Orbiting Carbon 42 constellation Taurus 42 Cassini Finds 42 KAGUYA 42 Westman Islands 42 Uninhabited 42 Eyjafjallajoekull 42 Sicily Mount Etna 42 Agus Budianto 42 aerosol particles 42 northwestern Peloponnese 42 Archipelagos 42 Grimsvoetn 42 Scientists Iceland Grimsvotn 42 polar latitudes 42 Nyamulagira 42 Tian Shan 42 Veniaminof 42 plume drifting 42 basaltic rock 42 basaltic lava 42 Leif Eriksson 42 aerosol concentrations 41 Grimsvötn volcano 41 Pu'u O'o 41 lava spewing 41 Aurora Australis 41 Icelandic volcano Eyjafjallajokull 41 Jolly Rosso 41 ejecta blanket 41 spews ash 41 tropopause 41 Rio das Ostras 41 ecliptic plane 41 Fridtjof Nansen 41 Larusson 41 Bazaruto Archipelago 41 Ogasawara Islands 41 Chris Waythomas 41 Chile Chaiten volcano 41 Fred Prata 41 altitudinal 41 Disembarking 41 volcanic ashes 41 ancient supercontinent 41 volcanoclastic rocks 41 carbonate minerals 41 Transiting 41 Marquesas islands 41 ENVISAT 41 Eyjafjallajökull volcano 41 Borge Ousland 41 meteorite crater 41 Hiva Oa 41 ash cloud drifted 41 spews lava 41 marine sediments 41 supervolcanoes 41 Weddell Sea 41 Skagerrak 41 Shinmoedake volcano 41 Augustine Volcano 41 Kelut 41 Soufriere Hills Volcano 41 Isklar 41 Südtirol 41 steam eruptions 41 Iceland Eyjafjallajoekull volcano 41 Gjoa 41 Tungurahua Volcano 41 Mount Toubkal 41 Rossby waves 41 sulfate aerosols 40 Grimsvötn 40 Spitzbergen 40 volcano observatory 40 nautical miles #km [002] 40 Colima volcano 40 eastern Kamchatka peninsula 40 Toba eruption 40 Kii Peninsula 40 Ophiuchi 40 Pechora Sea 40 southern latitudes 40 Wideroe 40 Guyane 40 Heceta 40 Sermilik Fjord 40 Kerguelen 40 Farafra 40 Basel Mulhouse 40 equatorial regions 40 Fimmvorduhals volcano 40 Misty Fjords 40 Akademik Ioffe 40 longitudes 40 Suriname Guyana 40 Pu'u O'o crater 40 Nazca 40 Axel Heiberg Island 40 Tumi geologist 40 Avinor 40 Yemenia A# 40 Llaima 40 Tectonic Plate 40 Ténéré 40 erupting lava 40 Antarctic icecap 40 Martian dust 40 Tuamotu Islands 40 erupt explosively 40 pyroclastic 40 Pu'u O'o vent 40 volcanoes 40 Mount Bromo volcano 40 Mount Asama 40 Erfoud 40 Iceland volcano Eyjafjallajokull 40 Iceland Eruption 40 Ocean Salinity 40 Antartica 40 Until Eyjafjallajokul pronounced 40 Sierra Madre del Sur 40 Carancas 40 lavas 40 Bangka Island 40 Khamsin 40 Galeras 40 Anvers Island 40 Leipzig Halle 40 Hydrothermal Vents 40 eruptive activity 39 Fiat Sedici 39 Chichagof 39 Soufrière Hills Volcano 39 Mount Galunggung 39 cirrus clouds 39 Iceland Grimsvoetn volcano 39 Keflavik Airport 39 geologist Magnus Tumi 39 Haraldur 39 Comet McNaught 39 WS# [002] 39 Mount Mazama 39 erupting Chaiten volcano 39 Duyfken 39 Gendol River 39 Mileage Marathon 39 Sorcerer II 39 Redoubt Volcano 39 Baltoro Glacier 39 Bouvet Island 39 temperamental Soufriere Hills 39 TD5 39 Lava flows 39 Galapagos Archipelago 39 Polynesian voyagers 39 #th meridian 39 Dumont d' Urville 39 Puu Oo 39 galactic equator 39 Okmok Volcano 39 Cape Foulweather 39 West Quoddy Head 39 meteoroids 39 Equatorial 39 sulfate aerosol 39 Ghana Togo Benin 39 Larsemann Hills 39 Babuyan Islands 39 molten rocks 39 Kasatochi 39 volcano Vesuvius 39 TAAG Angola 39 Nevado del Huila volcano 39 Crêpes Whaou 39 pyroclastic flow 39 Pavlof 39 Aldabra Atoll 39 Svalbard Archipelago 39 BPPTK 39 Tungurahua volcano 39 Sylvain Mondon 39 Kure Atoll 38 icefield 38 Lake Baringo 38 equatorial orbit 38 Tatar Strait 38 Axel Heiberg 38 Huahine 38 Recriminations erupt 38 star Spica 38 lunar magma 38 Eyjafjallajökull 38 Volcano Eruption 38 Volcanic 38 Chilean Fjords 38 Hurtigruten cruise 38 Grimsvoetn volcano 38 ITCZ 38 Mount Gamkonora 38 Indonesia volcano spews 38 Hammerfest Norway 38 Antarctica 38 Cape Verde archipelago 38 Antarctic continent 38 Avro RJ# [002] 38 airport operator Avinor 38 Taita Hills 38 sub tropic 38 Socotra Island 38 de Isora 38 Damien Gildea 38 Seychelles archipelago 38 Cabo Blanco 38 erupting Mount Sinabung 38 Keflavik International 38 dry powdery 38 Mount Tambora 38 ejecta 38 altocumulus 38 IceCube Neutrino Observatory 38 Antartic 38 duhl volcano erupted 38 Subduction Zone 38 volcanic 38 Nicolas Bérenger 38 crewless 38 Marquesas Islands 38 Fjords 38 oxidized mercury 38 FUSO 38 Kunlun Mountain 38 Ilha de 38 Santo Antao 38 volcanic mudflows 38 equatorial forests 38 Irosin 38 Archipel 38 yer kuhl 38 erupting volcanoes 38 subducted beneath 38 FYAH' plah yer kuh 38 Nihoa Island 38 clouds shrouding 38 Mt Etna 38 Triyani 38 für Luft und Raumfahrt 38 Mount Anak Krakatau 38 Soputan 38 Indonesia Merapi volcano 38 pyroclastic surges 38 Vastitas Borealis akin 38 sudden decompression 38 Soufriere Hills 38 Siberia Mongolia 38 Equator 38 meridional 38 sending panicked Sumatrans 38 RV Polarstern 38 oceanic plates 38 Montserrat volcano 38 micro meteorites 38 melting glacial 37 Chilean fjords 37 Kamoamoa eruption 37 Reykjavik Keflavik 37 Kirkjubaejarklaustur 37 Bingiza 37 Volcanic Eruption 37 Pytheas 37 Nethy 37 Ilamatepec 37 Ross Ice Shelf 37 Lake Nyos 37 Greenwich meridian 37 Sea Surface Temperature 37 lava flowed 37 seamount 37 Geomagnetic 37 Narvik Norway 37 prevailing westerly winds 37 Peregrine Adventures 37 Tundra Buggy 37 Ford ECOnetic 37 Eyjafjallajökull Volcano 37 Ecuador Tungurahua 37 Indian Ocean Dipole 37 lava extrusion 37 Eyjafjallajokull erupted 37 Dart Hut 37 Vatnajökull glacier 37 Proxima Centauri 37 ro ro ferry 37 Mount Sakurajima 37 Canal du Midi 37 Kerguelen Plateau 37 Iceland Volcano 37 anticyclonic 37 Artic Ocean 37 Volcanic Belt 37 spokesman Fridthor Eydal 37 geologist Jennifer Adleman 37 #km h [003] 37 Ambae Island 37 Saharan dust 37 trimaran Geronimo 37 Gudmundur Gudmundsson 37 El Lagarto 37 Mt Merapi 37 volcano spews 37 voyaging canoe 37 Great Rift Valley 37 ms Prinsendam 37 Guatemala Belize 37 Snaefellsnes peninsula 37 Jock Wishart 37 Greater Antilles 37 Spitsbergen Norway 37 Philippine volcano spews 37 Bulusan volcano 37 Kilauea summit 37 #'E 37 humpback minke 37 Muckle Flugga 37 MV Beluga SkySails 37 Beta Centauri 37 basalt 37 Polynesian Islands 37 Eyjafjallajoekull glacier 37 Neuchatel observatory 37 Celebes 37 zodiacal constellation 37 Oubangui river 37 Cape Otway 37 celestial equator 37 Ngomeni 37 Aldabra atoll 37 lava flows 37 Oscillation 37 Bijagos 37 Jakobsdottir 37 Rockot launcher 37 Zaharo south 37 Mount Etna 37 Nuku Hiva 37 Mount Tarawera 37 volcano 37 Porquerolles 37 Martian volcanoes 37 Elqui 37 mud volcano 37 Portuguese navigator 37 Sunda Strait 36 Barry Grommett spokesman 36 Fred Le Peutrec 36 Iceland Eyjafjallajökull volcano 36 northernmost tip 36 pyroclastic material 36 hardened lava 36 Alaska volcano erupts 36 Ouessant 36 active volcanos 36 Eyjafjallajoekull volcano 36 Iceland Eyjafjallajokull pronounced 36 Eyjafjallajokull erupts 36 Clipper Adventurer 36 equator 36 active volcanoes 36 #Â ° [002] 36 Jakobshavn Isbrae 36 volcanology center 36 Chaiten volcano 36 Saturn moon Enceladus 36 volcanology 36 Lamu Basin 36 Garonne 36 Kalimantan Borneo 36 Kilauea Volcano 36 Palaeo 36 volcanic ash clouds 36 subantarctic 36 Aleksey Maryshev 36 Mt Pinatubo 36 Mount Manaro 36 Mount Merapi spews 36 explosive eruptions 36 libration 36 Volcanic Ash 36 Songo Songo Island 36 Yellowstone caldera 36 Merapi volcano 36 penninsula 36 volcano erupting 36 Kristin Vogfjord geologist 36 Manam Island 36 ADM Aeolus 36 Yellowstone Caldera 36 Aquarius adore 36 lava eruptions 36 geosynchronous satellites 36 clouds obscuring 36 Laurentide ice sheet 36 Gondwanaland 36 Thomas Ruyant 36 Bandama 36 Clipperton Island 36 da Morte 36 volcano spews lava 36 Covenas 36 Game McGimsey 36 Grimsvotn GREEMSH votn volcano 36 icebreaker Kapitan Khlebnikov 36 Lombok Strait 36 Mount Sinabung 36 Mediterannean 36 volcanic ash 36 Knysna lagoon 36 Eyjafjallajokull 36 Magellan Straits 36 Mount Awu 36 lava fountains 36 Vulcanologists 36 southerly latitudes 36 Spurn Point 36 gritty pulverized 36 Quepos 36 deca BDEs 36 wake vortices 36 Wickaninnish Beach 36 Arctica 36 sent lava oozing 36 glacial silt 36 Cosmic Radiation 36 Cidade Velha 36 Localised flooding 36 roaring forties 36 Foxe Basin 36 ash billowing 36 Bulusan Volcano 36 Grimsvotn 36 crater 36 Carolyn Driedger 36 Mount Pinatubo 36 Mount Redoubt volcano 36 Bidegorry 36 Austral Islands 36 Keauhou Bay 36 Vatnajokull glacier 35 crowded airspaces 35 rocky islet 35 ash spews 35 raining ash 35 Contrails 35 surface hoar 35 reliable Zenit 3SL 35 Mount Katla 35 covered Delio Macchi 35 Kon Tiki raft 35 belched ash 35 Icelandic volcanoes 35 Kon Tiki expedition 35 Plaza Huincul 35 Puerto Ayora 35 springtime ozone 35 cosmic rays 35 water vapor 35 Ousland 35 Hornbein Couloir 35 coral atolls straddling 35 interstellar dust 35 Mt Erebus 35 highly elliptical orbit 35 Philippines Mayon volcano 35 erupting Mount Merapi 35 Kattegat 35 Mount Bulusan 35 ancient Inca ruins 35 VAAC 35 hypersonic jet 35 Antarctic 35 lava flowing 35 hazardous eruption 35 Sunda Straits 35 tephra 35 Halemaumau crater 35 RRS Discovery 35 flight LH# 35 guides Auriga Charioteer 35 volcanic gases 35 Chilkat 35 Sucia Island 35 Liberian flagged tanker 35 volcano spewed ash 35 uninhabited Vatnajokull glacier 35 Bau Gold 35 Mediteranean 35 Volcanic ash closes 35 Tropical Convergence 35 Yzerfontein 35 ash cloud spewed 35 Kerguelens 35 windblown sand 35 temperate latitudes 35 ay yah FYAH lah 35 Volcanic eruption 35 cataclysmic eruption 35 Mount Nyamulagira 35 Anatahan 35 Aniva Bay 35 Subtropical 35 cosmic radiation 35 volcano ash 35 aerosols 35 Pacific Subtropical Gyre 35 #.#N [002] 35 glacier 35 Na Pali 35 Eyjafjallajokul pronounced ay yah 35 Pacaya Volcano 35 Simien Mountains 35 Icelandic volcano drifted 35 Molucca 35 El Hierro 35 Lava spews 35 Pemba 35 intertropical convergence zone 35 Russia Kamchatka volcanoes 35 volcanic dust 35 volcanic rock 35 de los Andes 35 Tuamotus 35 Astrolabe 35 Cape Emine 35 Grael BRA 35 Norwegian razor clams 35 Yellowstone supervolcano 35 Merapi crater 35 volcanologist Agus Budianto 35 Hjordis Gudmundsdottir 35 Antarctic peninsula 35 Madeira Islands 34 Etna eruption 34 colder denser 34 tuna trawlers 34 #.#nm [003] 34 Marangu 34 Bulk Shipping 34 Sandhamn 34 Yves Parlier 34 Icelandic volcanologist 34 Syamsu Rizal 34 Merapi volcanology 34 orographic 34 volcanic lava 34 Iceland geophysicist Pall 34 Kelud 34 overlying layers 34 Adi Sucipto airport 34 spew lava 34 fumarole 34 Mount Shinmoedake 34 volcano Eyjafjallajökull 34 deepwater corals 34 zodiacal constellations 34 Piedras Blancas 34 Cercle Vert 34 airport administrator Isavia 34 Hydroptère 34 Spokeswoman Hjordis Gudmundsdottir 34 Shackleton expedition 34 LONGITUDE 34 duststorms 34 solar insolation 34 westerly winds blowing 34 Centre VAAC 34 Vripack 34 Réunion Island 34 volcano Eyjafjallajokull 34 Maranon Basin 34 active volcano Grimsvotn 34 IUCN Species Programme 34 Alphard 34 Syamsul Rizal 34 coastal upwelling 34 Puerto Montt Chile 34 Dominic Vittet 34 tawny hills 34 lava oozed 34 sailed upwind 34 grayish ash 34 Block L9 34 Siau island 34 desert scrubland 34 navigator Aksel Magdahl 34 volcano Katla 34 Pacaya volcano erupted 34 Sedna 34 flight AF# 34 magma dome 34 Ubangi river 34 strait separating 34 Hokianga Harbour 34 northerly latitudes 34 Eyjafjallajokull glacier erupted 34 Icelandic meteorological 34 Spanair flight JK# 34 lava flow 34 oceanic islands 34 Minke Whale 34 Balearic shearwater 34 Ringha 34 sooty particles 34 Faial 34 #d #h 34 Eyjafjallajokul volcano 34 spewed lava 34 subpolar 34 Isavia 34 EuroStar 34 Fjord 34 Funchal Madeira 34 pyroclastic flows 34 robust Zenit 3SL 34 Videy Island 34 Reynisson 34 Dondra Head 34 MV Kaawa 34 Centro Stile 34 #NM [001] 34 Magellan Strait 34 Gota Canal 33 FYAH lah yer kuhl 33 Eyjafjoell volcano 33 Roncador 33 sulphurous smell hung 33 volcanic eruption 33 Provideniya 33 Bransfield Strait 33 rumbling volcano 33 Peter Joergensen 33 Aegir 33 Apus 33 humid tropics 33 Zemlya 33 Kuroshio Current 33 Last Glacial Maximum 33 Patrice Carpentier 33 Nungwi 33 Expedition 33 Mare Australis 33 Waythomas 33 volcanic eruptions 33 Mt Tarawera 33 zodiacs 33 Destination Dunkerque 33 martian atmosphere 33 Celestial Pole 33 snowing heavily 33 Merapi eruption 33 impactors 33 ° #E 33 Nordhavn 33 Terrain Response ™ 33 TANS airline 33 Rufiji River 33 austral 33 Liz Wardley 33 Havila 33 prime meridian 33 anticyclones 33 porous sandstone 33 stratus clouds 33 easternmost tip 33 Lake Turkana 33 Yasawa Islands 33 Kosatka 33 Kenfig Nature Reserve 33 volcano erupts 33 Cape Farewell 33 Indonesia volcano erupts 33 northerly 33 Iceland volcano 33 Bashi Channel 33 degrees #'N 33 Iceland Eyjafjallajökull 33 Drake Passage 33 Laki volcano 33 started erupting lava 33 choking irritants 33 ms Veendam 33 Sahara Desert 33 Van Den Heede 33 Sri Sakti 33 cabin pressurisation 33 Nimrod expedition 33 LCF Rothschild Group 33 Sigurdur 33 Sanxenxo 33 flight FR# 33 Tuamotu 33 rhumbline 33 Atlantic Multidecadal Oscillation 33 Male Atoll 33 thick fog enveloped 33 Pakea Bizkaia 33 fog blanketed 33 Wouter Verbraak 33 Iceland spewing 33 Eyjafjoell 33 sisterships 33 gale force westerly winds 33 Helsinki Vantaa airport 33 #ft trimaran 33 Tokai Challenger 33 pinpoints Lopez Alegria 33 Maisu 33 Talisker Bounty Boat 33 Orakei Wharf 33 ashfall advisory 33 Tokachi 33 sedimentary rock 33 icesheet 33 Elburgon 33 explorer Ferdinand Magellan 33 Circumnavigation 33 Barents Seas 33 volcano eruption 33 volcanic ash blanketed 33 volcanic ash drifts 32 drifting eastward 32 equatorial waters 32 Sulfur dioxide 32 Sunreef Power 32 Turrialba volcano 32 Mintaka 32 Mount Kelud volcano 32 Transsyberia 32 Selfoss 32 spew ash 32 Woodvale Atlantic 32 Volcanic eruptions 32 Arafura Sea 32 Nitinat Lake 32 Gatun Locks 32 latitudes 32 Soufriere Hills volcano 32 Playa Norte 32 Scorpius 32 Delphinus 32 -# ° C. [001] 32 Manu'a islands 32 Omo Block 32 easyJet www.easyjet.com 32 Orion Expedition 32 Indonesian volcano spews 32 Iceland Eyjafjallajokull volcano 32 Java Mount Bromo 32 eruptive phase 32 volcano spewed lava 32 Michel Kleinjans 32 ash belching 32 Taha'a 32 Eyjafjallajokull volcano eruption 32 Steve Ravussin 32 Malay Peninsula 32 Pandaw 32 highlands 32 mud oozed 32 westerly trough 32 Clipper Maid 32 NW'ly breeze 32 west coast 32 perihelion 32 Eyjafjallajökull eruption 32 sailing catamaran 32 Ballena 32 Volcano spews 32 volcano erupted 32 micrometeoroids 32 unstable lava dome 32 Grand Vitara compact 32 Mount Merapi spewed 32 triggering tidal waves 32 Sani Pass 32 Charles Caudrelier 32 Panamanian flagged freighter 32 Aqua Expeditions 32 Capo Passero 32 sulphate aerosols 32 masted barque 32 windshear 32 Helen Chivers 32 Indonesia Mount Kelud 32 -# degrees Celcius 32 droplet nuclei 32 plume 32 volcanos 32 Andy Bodenham 32 Shell Va'a 32 volcanic ash originating 32 Wrangell Mountains 32 Volcanologists 32 ashfall 32 spewing plumes 32 Tungurahua 32 Nitrogen oxides 32 Cape Adare 32 megaship 32 anticyclone 32 lava cascading 32 Cabo Frio 32 ancient Polynesians 32 Esimit Europa 32 Iceland Eyjafjallajokull ay yah 32 Tanana rivers 32 meteor impacts 32 supervolcano 32 Argomulyo Yogyakarta Indonesia 32 molten rock 32 Jean Baptiste Dejeanty 32 Mount Merapi wrath 32 Scotland Outer Hebrides 32 Iceland volcano shuts 32 Mount Merapi erupts 32 Scrabster 32 Karma Kandara 32 Wilpena 32 Kerguelen Island 32 SSTs 32 Eyjafjallajokul 32 captured interstellar dust 32 Seaforth Sportfishing 32 temperature inversion 32 Berlin Schonefeld 31 Eurocontrol 31 Volcano eruptions 31 Volcanic ash halts 31 Iceland Eyjafjallajokul volcano 31 Tanguy de 31 Cruise Ship Runs Aground 31 Punta San Jacinto 31 pericentre 31 Bella Mente 31 Redoubt blew 31 Ubinas volcano 31 Arusha Moshi 31 Thicker cloud 31 paddle wheeled steamer 31 Corentyne River 31 Koh Rong 31 Langadas 31 Pacific Decadal Oscillation 31 O.Berk Company 31 Dusseldorf Weeze 31 Volcanic gases 31 Gusting 31 Gunnar Gudmundsson geophysicist 31 Mount Redoubt 31 Runway #R