Home›Natural Features›All Natural FeaturesBrowse ByAll Natural FeaturesReference and ClassificationVerifiedThe physical Earth itself, apart from the political and administrative places people have drawn over it: landforms, bodies of water, protected areas set aside for their natural value, and the physical processes that shape and continue to reshape them. This section holds every natural feature the atlas covers, from a single mountain range or river to the wider process that formed it, so a reader can look up one feature directly or follow the process that explains why it looks the way it does.FactsAll Natural FeaturesSourcesComments (0)Reader Challenges (0)FactsComparisonGeography BranchWell-attestedPhysical Geography 1All Natural FeaturesFilter Results1,858 entriesCountryAllAfghanistan (1)Algeria (1)Argentina (4)Australia (21)Austria (6)Belgium (1)Belize (6)Bolivia (2)Botswana (4)Brazil (5)Bulgaria (4)Cambodia (3)Cameroon (2)Canada (22)Central African Republic (3)Chad (2)Chile (43)China (6)Colombia (2)Costa Rica (31)Croatia (9)Czechia (5)Democratic Republic of the Congo (4)Denmark (8)Ecuador (3)Estonia (6)Ethiopia (3)Finland (33)France (6)Germany (19)Greece (24)Guyana (1)Haiti (1)Hungary (10)Iceland (3)India (53)Indonesia (2)Iran (2)Ireland (8)Israel (1)Italy (25)Jamaica (1)Japan (36)Jordan (3)Kenya (26)Kiribati (1)Latvia (4)Lithuania (5)Madagascar (2)Malaysia (4)Malta (1)Mauritania (1)Mauritius (1)Mexico (2)Mongolia (1)Mozambique (1)Myanmar (1)Namibia (4)Nepal (4)Netherlands (3)New Zealand (14)Niger (1)Nigeria (1)Norway (48)Pakistan (1)Palau (1)Panama (3)Peru (1)Philippines (1)Poland (28)Portugal (1)Qatar (1)Russia (7)Rwanda (2)Senegal (1)Seychelles (1)Slovakia (10)Slovenia (2)South Africa (22)South Korea (1)Spain (16)Sri Lanka (3)Sweden (32)Switzerland (1)Syria (1)Taiwan (2)Tanzania (5)Thailand (2)Togo (1)Turkey (1)Tuvalu (1)Uganda (2)Ukraine (1)United Kingdom (20)United States (73)Venezuela (5)Vietnam (1)Yemen (1)Zambia (1)Zimbabwe (1)Showing the 100 most common of 103 options.Landform TypeAllCanyons and Gorges (World) (18)Deserts (World) (33)Glaciers and Ice Sheets (World) (30)Grasslands and Savannas (World) (20)Marine and Coastal Landforms (World) (49)Mountain Ranges and Massifs (World) (27)Peaks and Summits (World) (32)Peninsulas (World) (38)Plateaus and Highlands (World) (24)Rainforests and Tropical Landscapes (World) (10)River Basins and Drainage Basins (World) (23)Rock Formations and Monoliths (World) (34)Valleys and Rift Systems (World) (20)Waterfall and Cataract Landforms (World) (6)SubdisciplineAllAtmospheric and Climatic Processes (World) (47)Biogeochemical and Pedological Processes (World) (31)Geomorphology (World) (57)Glacial and Periglacial Processes (World) (33)Hydrological and Oceanic Processes (World) (34)Tectonics and Volcanism (World) (42)Water Body TypeAllEstuaries and Deltas (World) (19)Fjords (World) (14)Gulfs and Bays (World) (41)Lakes (World) (72)Oceans (World) (5)Reservoirs (World) (12)Rivers of Africa (22)Rivers of Asia (32)Rivers of Australia and Oceania (6)Rivers of Europe (24)Rivers of North America (19)Rivers of South America (14)Seas (World) (58)Straits and Channels (World) (35)Waterfalls and Cataracts (World) (24)Wetlands and Tidal Flats (World) (12)ContinentAllAfrica (175)Antarctica (14)Asia (302)Australia (78)Europe (476)North America (257)South America (112)IUCN CategoryAllHabitat and Species Management Areas (World) (93)National Parks of Afghanistan (1)National Parks of Africa (64)National Parks of Asia (109)National Parks of Austria (6)National Parks of Bulgaria (3)National Parks of Cambodia (1)National Parks of Croatia (8)National Parks of Denmark (1)National Parks of Estonia (5)National Parks of Europe (258)National Parks of Finland (31)National Parks of France (1)National Parks of Georgia (1)National Parks of Germany (17)National Parks of Greece (17)National Parks of Hungary (9)National Parks of Iceland (3)National Parks of India (50)National Parks of Indonesia (2)National Parks of Iran (2)National Parks of Ireland (6)National Parks of Italy (25)National Parks of Japan (34)National Parks of Latvia (3)National Parks of Lithuania (4)National Parks of Malaysia (3)National Parks of Mongolia (1)National Parks of Myanmar (1)National Parks of Nepal (3)National Parks of North America (32)National Parks of Norway (40)National Parks of Oceania and the Pacific (28)National Parks of Pakistan (1)National Parks of Poland (25)National Parks of Portugal (1)National Parks of Slovakia (9)National Parks of Slovenia (1)National Parks of South America (61)National Parks of South Korea (1)National Parks of Spain (16)National Parks of Sri Lanka (1)National Parks of Sweden (21)National Parks of Taiwan (2)National Parks of Thailand (2)National Parks of the Caribbean and Central America (36)National Parks of the Czech Republic (4)National Parks of the Netherlands (1)National Parks of the United Kingdom (1)National Parks of Vietnam (1)Natural Monuments or Features (World) (40)Protected Areas with Sustainable Use of Natural Resources (World) (26)Protected Landscapes and Seascapes (World) (51)Strict Nature Reserves (World) (13)Wilderness Areas (World) (18)TimescaleAllCenturies (26)Days (44)Decades (14)Hours (22)Millennia (2)Millions of Years (31)Minutes (17)Months (12)Seconds (12)Thousands of Years (45)Weeks (6)Years (95)Area or Depth BandAll117,000 to 720,000 sq km (45)15,100 to 115,000 sq km (46)2,400 to 13,512 sq km (46)25 to 2,325 sq km (45)797,000 to 161,760,000 sq km (46)Country or Region Located InAllAustralia (1)Brunei (1)Canada (1)Chile (1)Denmark (1)Germany (1)Greece (1)Indonesia (2)Malaysia (1)Netherlands (1)Papua New Guinea (1)Philippines (1)Sweden (1)United Kingdom (1)National Designation TypeAllBiosphere Reserve (24)Bird Sanctuary (4)Conservation Area (2)Dark-Sky Park (1)Dark-Sky Preserve (1)Experimental Forest (1)Faunal Reserve (8)Forest Park (2)Forest Reserve (7)Game Reserve (6)Green Belt (1)II (1)International Park (1)IUCN Category II (1)IUCN Category V (Protected Landscape) (1)Marine Natural Park (1)Marine Park (4)Marine Protected Area (14)Marine Reserve (2)Marine Sanctuary (1)National and State Parks (1)National forest park (1)National Forest Scenic Area (1)National Geopark (1)National Historic Site (2)National Marine Park (2)National Memorial (2)National Monument (9)National Monument and Preserve (1)National Natural Park (1)National Nature Reserve (1)National Park (607)National Park and Preserve (1)National Park Reserve (1)National Scenic Area (1)National Wildlife Reserve (1)Natura 2000 Site (4)Nature Reserve (17)Private Preserve (1)Protected Landscape (1)Provincial Park (1)Regional Natural Park (2)Scenic Area (1)Special Reserve (1)State Historic Park (1)State Historic Site (1)State Park (9)Tiger Reserve (1)Transfrontier Park (2)UNESCO Biosphere Reserve (1)Urban Park System (1)Wilderness Area (13)Wildlife Conservancy (1)Wildlife Refuge (7)Wildlife Sanctuary (3)World Heritage Site (1)Zapovednik (5)Zapovednik (strict nature reserve) (2)Process NatureAllAtmospheric Circulation (35)Biogeochemical or Pedological (28)Climatic (13)Coastal (7)Fluvial (17)Geomorphological (37)Glacial (25)Hydrological (24)Oceanic (17)Tectonic (41)Bordering Land or CountryAllAlbania (2)Argentina (1)Australia (7)Azerbaijan (1)Bahrain (1)Bangladesh (1)Barbados (1)Belgium (1)Belize (2)Benin (1)Bolivia (1)Bosnia and Herzegovina (1)Brunei (1)Bulgaria (1)Burundi (1)Cabo Verde (1)Cambodia (1)Cameroon (2)Canada (12)Chad (1)Chile (1)China (6)Colombia (2)Cuba (4)Democratic Republic of the Congo (1)Denmark (6)Djibouti (2)Dominican Republic (1)Egypt (4)Equatorial Guinea (1)Eritrea (1)Estonia (3)Finland (3)France (10)Gabon (1)Germany (3)Ghana (1)Greece (2)Guatemala (1)Haiti (2)Honduras (2)Iceland (4)India (6)Indonesia (13)Iran (3)Iraq (1)Ireland (1)Israel (4)Italy (9)Jamaica (1)Japan (7)Jordan (3)Kazakhstan (2)Kenya (1)Kuwait (1)Latvia (2)Libya (1)Lithuania (1)Madagascar (1)Malawi (1)Malaysia (4)Malta (1)Mexico (4)Morocco (1)Mozambique (2)Myanmar (3)Netherlands (2)New Zealand (2)Nicaragua (2)Niger (1)Nigeria (2)North Korea (2)Norway (5)Oman (3)Pakistan (2)Panama (2)Papua New Guinea (6)Peru (1)Philippines (4)Poland (1)Qatar (1)Russia (17)Saudi Arabia (4)Solomon Islands (2)Somalia (2)South Korea (3)Spain (5)Sri Lanka (2)Sweden (5)Taiwan (4)Tanzania (3)Thailand (2)Turkey (2)Ukraine (2)United Arab Emirates (2)United Kingdom (4)United States (12)Venezuela (2)Vietnam (4)Yemen (3)Showing the 100 most common of 131 options.Caused ByAllAeolian Processes (5)Atmospheric Circulation (4)Atmospheric Convection (3)Bioaccumulation (1)Chemical Weathering (1)Cloud Formation (1)Condensation (2)Coriolis Effect (2)Crustal Extension (1)Deposition and Sedimentation (4)Effusive Eruption (1)Erosion (2)Evaporation (3)Explosive Eruption (2)Faulting (1)Flooding (1)Fluvial Erosion (6)Frost Heave (1)Geothermal Activity (1)Glacial Advance (1)Glacial Deposition (5)Glacial Erosion (6)Glacial Retreat (1)Glaciation (2)Glacier Mass Balance (1)Groundwater Flow (5)Hadley Cell Circulation (1)Headward Erosion (2)Ice Sheet Dynamics (1)Infiltration (1)Karstification (2)Longshore Drift (1)Magmatism (2)Mantle Convection (1)Nutrient Cycling (1)Orogeny (1)Orographic Lift (2)Plate Tectonics (2)River Meandering (1)Seismogenesis (1)Sheet Erosion (2)Streamflow (1)Subduction (1)Supercell Formation (1)Surface Runoff (2)The Carbon Cycle (1)Thunderstorm Formation (5)Tidal Action (1)Tropical Cyclone Formation (1)Volcanism (2)Wave Erosion (2)Weathering (7)Elevation or Size BandAll-125 to 1,520 m (16)1,545 to 2,683 m (15)2,925 to 4,401 m (16)4,409 to 5,753 m (15)5,895 to 8,849 m (16)International DesignationAllRamsar Site (Wetland of International Importance) (81)UNESCO Biosphere Reserve (100)UNESCO Global Geopark (12)UNESCO World Heritage Site (170)Flows ThroughAllAfghanistan (2)Angola (4)Argentina (3)Australia (2)Austria (1)Azerbaijan (1)Bangladesh (1)Belarus (1)Benin (1)Bolivia (1)Botswana (3)Brazil (9)Bulgaria (1)Burkina Faso (1)Cameroon (1)Canada (9)Central African Republic (2)Chad (1)Chile (1)China (8)Colombia (5)Croatia (1)Czechia (2)Democratic Republic of the Congo (3)Egypt (1)Ethiopia (4)France (4)Gambia (1)Georgia (1)Germany (4)Ghana (1)Guatemala (1)Guinea (2)Guyana (1)Hungary (1)India (8)Iran (1)Iraq (2)Italy (2)Kazakhstan (3)Kenya (1)Kyrgyzstan (1)Lesotho (1)Mali (2)Mauritania (1)Mexico (3)Moldova (1)Mongolia (1)Mozambique (2)Myanmar (2)Namibia (4)Netherlands (1)New Zealand (2)Niger (1)Nigeria (2)Pakistan (4)Papua New Guinea (2)Paraguay (2)Peru (1)Poland (1)Portugal (2)Republic of the Congo (1)Romania (1)Russia (12)Senegal (2)Serbia (1)Slovakia (1)Somalia (2)South Africa (3)South Korea (1)South Sudan (2)Spain (3)Sudan (3)Switzerland (2)Syria (2)Tajikistan (2)Tanzania (1)Thailand (2)Transnistria (1)Turkey (3)Turkmenistan (1)Uganda (2)Ukraine (2)United Kingdom (1)United States (12)Uruguay (1)Uzbekistan (2)Venezuela (3)Vietnam (1)Zambia (1)Zimbabwe (2)Formation ProcessAllAeolian Processes (13)Alluvial Fan Formation (1)Bank Erosion (1)Caldera Formation (1)Coastal Processes (4)Continental Collision (1)Continental Drift (1)Continental Rifting (7)Crustal Extension (1)Delta Formation (2)Deposition and Sedimentation (22)Desertification (1)Dune Formation (6)Effusive Eruption (1)Epeirogeny (2)Erosion (35)Evaporation (1)Faulting (5)Fluvial Erosion (11)Folding (2)Geothermal Activity (1)Glacial Deposition (3)Glacial Erosion (11)Glacial Horn Formation (1)Glacial Isostatic Rebound (2)Glacial Till Deposition (1)Glaciation (15)Glacier Mass Balance (1)Headward Erosion (2)Hoodoo Formation (1)Karstification (6)Lava Dome Formation (1)Lithification (1)Loess Deposition (1)Longshore Drift (1)Magmatism (4)Mass Wasting (1)Mechanical Weathering (1)Natural Arch Formation (1)Natural Levee Formation (1)Normal Faulting (2)Orogeny (16)Outwash Plain Formation (1)Oxbow Lake Formation (1)Peat Formation (1)Pediment Formation (1)Permafrost and Periglacial Processes (2)Plate Tectonics (16)River Meandering (1)Rock Glacier Formation (1)Rockfall (1)Sea Ice Formation (1)Sea Level Change (8)Seafloor Spreading (1)Sinkhole Formation (2)Solifluction (1)Subduction (6)Terrane Accretion (1)Volcanism (29)Wave Erosion (7)Weathering (5)Marine or TerrestrialAllCoastal (Marine and Terrestrial) (72)Marine (56)Terrestrial (638)Part OfAllAtmospheric Circulation (7)Chemical Weathering (1)Coastal Processes (3)Colorado River (1)Deposition and Sedimentation (1)Effusive Eruption (3)Erosion (1)Explosive Eruption (5)Faulting (3)Fluvial Erosion (1)Glacial Deposition (1)Glacial Erosion (1)Glaciation (6)Indus River (1)Ionian Sea (1)Irrawaddy River (1)Isostasy (1)Mass Wasting (5)Mechanical Weathering (3)Niger River (1)Nitrogen Cycle (2)Nutrient Cycling (6)Ob River (1)Ocean Circulation and Currents (7)Pedogenesis (8)Permafrost and Periglacial Processes (6)Plate Tectonics (12)Po River (1)Rock Cycle (7)Saint Lawrence River (1)The Amazon River (1)The Carbon Cycle (3)Thunderstorm Formation (1)Volcanism (2)Water Cycle (9)Weathering (3)Governance TypeAllGovernance by Government (609)Governance by Indigenous Peoples and Local Communities (4)Private Governance (16)Shared Governance (13)Parent Landform or RangeAllMountain Range (1)Valley (1)Establishment EraAll1907 (2)1908 (4)1909 (9)1910 (2)1916 (3)1917 (2)1918 (4)1919 (4)1920 (3)1922 (4)1926 (3)1927 (2)1928 (2)1929 (2)1930 (4)1931 (3)1932 (5)1934 (14)1935 (5)1936 (5)1937 (4)1938 (4)1939 (6)1940 (4)1941 (3)1942 (4)1944 (2)1945 (2)1946 (2)1947 (2)1948 (3)1949 (4)1950 (6)1951 (6)1952 (6)1953 (2)1954 (6)1955 (6)1956 (14)1957 (2)1958 (3)1959 (10)1960 (6)1961 (4)1962 (9)1963 (7)1964 (13)1966 (3)1967 (11)1968 (5)1969 (8)1970 (10)1971 (13)1972 (7)1973 (17)1974 (16)1975 (7)1976 (9)1977 (6)1978 (16)1979 (9)1980 (12)1981 (12)1982 (23)1983 (7)1984 (8)1985 (7)1986 (13)1987 (11)1988 (11)1989 (12)1990 (15)1991 (29)1992 (10)1993 (16)1994 (6)1995 (8)1996 (14)1997 (11)1998 (8)1999 (13)2000 (4)2001 (9)2002 (11)2003 (10)2004 (10)2005 (10)2006 (7)2007 (9)2008 (4)2009 (10)2010 (7)2011 (3)2012 (3)2013 (4)2014 (5)2015 (4)2016 (7)2017 (4)2018 (8)Showing the 100 most common of 127 options.Shaped ByAllAeolian Processes (2)Basin Formation (2)Caldera Formation (4)Canyon Formation (1)Coastal Processes (1)Continental Collision (1)Continental Rifting (19)Crustal Extension (1)Delta Formation (13)Deposition and Sedimentation (15)Endorheic Basin Formation (1)Epeirogeny (2)Erosion (8)Faulting (9)Flooding (3)Floodplain Formation (1)Fluvial Erosion (5)Folding (1)Glacial Deposition (1)Glacial Erosion (16)Glacial Isostatic Rebound (1)Glacial Retreat (3)Glaciation (24)Headward Erosion (1)Karstification (1)Knickpoint Retreat (1)Orogeny (4)Plate Tectonics (27)River Avulsion (1)River Capture (1)Sea Level Change (13)Seafloor Spreading (1)Strike-Slip Faulting (2)Subduction (6)Tidal Action (3)Volcanism (4)Wave Erosion (1)Weathering (1)Year Consensus ReachedAll1875 (1)1889 (1)1890 (1)1930 (1)1960 (1)1967 (3)1983 (1)Area BandAll0.038007 to 53 sq km (157)1,865 to 1,550,000 sq km (157)211.61 to 643.4 sq km (155)54 to 208.56 sq km (155)647.37 to 1,863.75 sq km (157)LengthAll1,126 to 2,525 km (11)15 to 320 km (11)2,574 to 9,600 km (11)346 to 700 km (12)725 to 1,120 km (11)Governing BodyAllAdministracion de Parques Nacionales (4)Aqaba Special Economic Zone Authority (2)Australian state parks service (6)BC Parks (1)Bushy Park Trust (1)Chico Mendes Institute for Biodiversity Conservation (Brazil) (4)Chinese scenic area administration bureau (2)City or municipal government (5)Columbia River Gorge Commission (1)Consejería de Medio Ambiente y Ordenación Territorial (1)Corporacion Nacional Forestal (Chile) (39)County Governor (Norway) (2)Czech national park administration (4)Department of Conservation (14)Department of National Parks and Wildlife Conservation (Nepal) (4)Department of National Parks, Wildlife and Plant Conservation (Thailand) (2)Department of Wildlife Conservation (Sri Lanka) (2)Director of National Parks (Parks Australia) (4)Directorate for Nature Management (34)Dja Conservation Services (1)Ethiopian Wildlife Conservation Authority (3)Forestry England (1)French Office for Biodiversity (2)Georgia Agency of Protected Areas (1)German national park administration (Nationalparkverwaltung) (7)Government of India or an Indian state government (7)Guam Department of Agriculture (1)Guyana Protected Areas Trust (1)Haliburton Forest Group (1)Historic Scotland (1)Hol Chan Marine Reserve Trust Fund Committee (1)Hong Kong Agriculture, Fisheries and Conservation Department (1)Hungarian national park directorate (3)ICNF (Portugal) (1)Indian state forest department (22)INPARQUES (Venezuela) (3)Institut Congolais pour la Conservation de la Nature (4)Kalahari Conservation Society Trust (Nata community trust) (1)Kenya Wildlife Service (21)Ma'u Henua Indigenous Community (1)Madagascar National Parks (2)Metsahallitus (Finland) (33)Ministero dell Ambiente (Italy) (20)Ministry of Agriculture, Forestry and Fisheries (Cambodia) (1)Ministry of Environment and Forests (India) (7)Ministry of the Environment (105)Monteverde Conservation League (1)Myanmar Nature and Wildlife Conservation Division (1)National Forest Department (Greece) (2)National park public institution (5)National Park Service (29)National Parks and Wildlife Service (Ireland) (7)National System of Conservation Areas (SINAC) (28)National System of Protected Areas (Colombia) (2)Nature Conservation Agency (Latvia) (1)Naturvardsverket (Sweden) (29)Ngorongoro Conservation Area Authority (1)NOAA Office of National Marine Sanctuaries (United States) (2)Norwegian Environment Agency (6)Norwegian national park board (nasjonalparkstyre) (2)NSW National Parks and Wildlife Service (3)Parcs nationaux de France (2)Parks and Wildlife Commission of the Northern Territory (2)Parks Canada (19)Parks Victoria (3)Patrick Henry Memorial Foundation (1)Republic of Kiribati (1)Royal Society for the Conservation of Nature (1)Sabah Parks (Malaysia) (2)SERNANP (Peru) (1)SERNAP (Bolivia) (1)Seychelles Islands Foundation (1)Slovak national park administration (8)South African National Parks (21)Spanish National Parks Autonomous Agency (2)Sri Lanka Forest Department (1)STINAPA Bonaire (1)Tanzania National Parks Authority (2)U.S. Forest Service (17)Uganda Wildlife Authority (1)UK National Park Authority (15)Ulster Wildlife (1)United States Fish and Wildlife Service (6)United States state park agency (9)Uttar Pradesh State Government (1)Vietnam Provincial People Committee (1)Zambia Wildlife Authority (1)Zimbabwe Parks and Wildlife Management Authority (1)Show ResultsBrowseCompareSelect all 50Hanging ValleyValleys and Rift SystemsHanging Valley FormationGlacial and Periglacial ProcessesHaparanda Archipelago National ParkNational ParkHardangerfjordFjordsHardangervidda National ParkNational ParkHarz National ParkNational ParkHat Noppharat Thara-Mu Ko Phi Phi National ParkNational ParkHavasu FallsWaterfalls and CataractsHawaiian EruptionTectonics and VolcanismHeadlandPeninsulasHeadward ErosionGeomorphologyHearts Content Scenic AreaProtected Landscape and SeascapeHeathGrasslands and SavannasHell's Gate National ParkNational ParkHelmand RiverRiversHelvetinjarvi National ParkNational ParkHemis National ParkNational ParkHidakasanmyaku-Erimo-Tokachi National ParkNational ParkHighlandPlateaus and HighlandsHiidenportti National ParkNational ParkHillockPeaks and SummitsHindu KushMountain Ranges and MassifsHoburg ShoalHabitat and Species Management AreaHogbackPlateaus and HighlandsHohe Tauern National ParkNational ParkHol Chan Marine ReserveHabitat and Species Management AreaHoodooRock Formations and MonolithsHoodoo FormationGeomorphologyHornGlaciers and Ice SheetsHorn of AfricaPeninsulasHornopirén National ParkNational ParkHorstValleys and Rift SystemsHortobagy National ParkProtected Landscape and SeascapeHossa National ParkNational ParkHot Spot VolcanismTectonics and VolcanismHot SpringRock Formations and MonolithsHotokenumaHabitat and Species Management AreaHudson BayGulfs and BaysHudson RiverRiversHuerquehue National ParkNational ParkHügellandPlateaus and HighlandsHumificationBiogeochemical and Pedological ProcessesHunsrück-Hochwald National ParkNational ParkHwange National ParkNational ParkHydraulic ActionGeomorphologyIberian PeninsulaPeninsulasIce CapGlaciers and Ice SheetsIce FieldGlaciers and Ice SheetsIce SheetGlaciers and Ice SheetsIce Sheet DynamicsGlacial and Periglacial Processes← Previous1…1213141516…38Next →Sources1. Geography - Wikipediatier 2WikipediaLead section, branches of geography sentence, physical sideQuote, Lead section, branches of geography sentence, physical sideSome publications limit the number of branches to physical and human, describing them as the principal branches.View the SourceComments (0)No comments yet. Be the first to share a thought.Sign in to join the discussion.Reader Challenges (0)No disputes yet. Spotted an error or a better source? Open the first one.Sign in to dispute this or suggest a correction.