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A ring-shaped coral reef enclosing a lagoon.

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A ring-shaped coral reef enclosing a lagoon.

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Nanumea Atoll: Nanumea is the northwesternmost atoll in the Polynesian nation of Tuvalu; Nanumea is 4 km² with a population of 512 people.

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Nanumea Atoll: Nanumea is the northwesternmost atoll in the Polynesian nation of Tuvalu; Nanumea is 4 km² with a population of 512 people.

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A barren area eroded into fantastic forms.

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A barren area eroded into fantastic forms.

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Badlands National Park: Its dramatic landscapes span layered rock formations, steep canyons and towering spires. ;Bison, bighorn sheep and prairie dogs inhabit its sprawling grasslands.

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Badlands National Park: Its dramatic landscapes span layered rock formations, steep canyons and towering spires. ;Bison, bighorn sheep and prairie dogs inhabit its sprawling grasslands.

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A body of water forming an indentation of the shoreline.

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A body of water forming an indentation of the shoreline.

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Chesapeake Bay: The Chesapeake Bay is the largest estuary in the United States. ;The Bay is located in the Mid-Atlantic region and is primarily separated from the Atlantic Ocean.

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Chesapeake Bay: The Chesapeake Bay is the largest estuary in the United States. ;The Bay is located in the Mid-Atlantic region and is primarily separated from the Atlantic Ocean.

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An isolated hill or mountain rising abruptly above the surrounding land.

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An isolated hill or mountain rising abruptly above the surrounding land.

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Airport Tower: Airport Tower is a 700-foot tall sandstone butte. ;Located in Canyonlands National Park, in San Juan County, Utah.

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Airport Tower: Airport Tower is a 700-foot tall sandstone butte. ;Located in Canyonlands National Park, in San Juan County, Utah.

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Black Canyon: It surrounds part of a deep, steep-walled gorge. ;South rims have views of the Black Canyon's dramatic drops and the striated Painted Wall cliff.

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Black Canyon: It surrounds part of a deep, steep-walled gorge. ;South rims have views of the Black Canyon's dramatic drops and the striated Painted Wall cliff.

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Fisher Ridge Cave System: The Fisher Ridge Cave System is a cave system located in Hart County, Kentucky, United States, near Mammoth Cave National Park. ;It had been mapped to a length of 130.001 miles, making it the fifth-longest cave in the United States and the tenth-longest in the world.

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Fisher Ridge Cave System: The Fisher Ridge Cave System is a cave system located in Hart County, Kentucky, United States, near Mammoth Cave National Park. ;It had been mapped to a length of 130.001 miles, making it the fifth-longest cave in the United States and the tenth-longest in the world.

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The bed of a stream, river, or other waterway.

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The bed of a stream, river, or other waterway.

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Great Bras d'Or Channel: The Great Bras d'Or Channel is the main sea entrance into the Lakes. ;Stretching 17 miles from Noir Point to Kempt Head.

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Great Bras d'Or Channel: The Great Bras d'Or Channel is the main sea entrance into the Lakes. ;Stretching 17 miles from Noir Point to Kempt Head.

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Kalaupapa Cliffs: One of the most remote locations in Hawai'i. ;The peninsula and its towering cliffs were created through several episodes of volcanic and geologic activity, over millions of years.

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Kalaupapa Cliffs: One of the most remote locations in Hawai'i. ;The peninsula and its towering cliffs were created through several episodes of volcanic and geologic activity, over millions of years.

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A piece of land jutting into the sea or some other large body of water.

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A piece of land jutting into the sea or some other large body of water.

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Cape Cod: Cape Cod, a hook-shaped peninsula of the U.S. state of Massachusetts. ;Is a popular summer destination.

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Cape Cod: Cape Cod, a hook-shaped peninsula of the U.S. state of Massachusetts. ;Is a popular summer destination.

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Galapagos Islands: The Galápagos Islands is a volcanic archipelago in the Pacific Ocean. ;It lies 1,000km off its coast.

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Galapagos Islands: The Galápagos Islands is a volcanic archipelago in the Pacific Ocean. ;It lies 1,000km off its coast.

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One of the main landmasses of the globe.

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One of the main landmasses of the globe.

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North America: The population is 579 million. ;Area is 9.54 million square miles.

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North America: The population is 579 million. ;Area is 9.54 million square miles.

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A flat plain of deposit between diverging branches of a river.

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A flat plain of deposit between diverging branches of a river.

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Amazon Delta: Formed by the Amazon River and Tocantins River. ;It is located in the Brazilian states of Para and Amapa.

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Amazon Delta: Formed by the Amazon River and Tocantins River. ;It is located in the Brazilian states of Para and Amapa.

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A region that is so dry because of little rainfall.

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A region that is so dry because of little rainfall.

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Namib Desert: The Namib Desert is in the continent of South Africa. ;The desert has the area of 31,274.

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Namib Desert: The Namib Desert is in the continent of South Africa. ;The desert has the area of 31,274.

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White Sands National Park: Located in New Mexico. ;The park covers 145,762 acres in the Tularosa Basin.

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White Sands National Park: Located in New Mexico. ;The park covers 145,762 acres in the Tularosa Basin.

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A long, narrow arm of sea bordered by steep cliffs.

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A long, narrow arm of sea bordered by steep cliffs.

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Ilulissat Icefjord: Is located in Greenland. ;Icefjord runs west 40 km from the Greenland ice sheet.

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Ilulissat Icefjord: Is located in Greenland. ;Icefjord runs west 40 km from the Greenland ice sheet.

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A large piece of land covered with trees.

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A large piece of land covered with trees.

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Spiny Forest: The elevation is 180-656 feet. ;The biome is desert and xeric shrublands.

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Spiny Forest: The elevation is 180-656 feet. ;The biome is desert and xeric shrublands.

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A hot spring that shoots jets of water into the air.

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A hot spring that shoots jets of water into the air.

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Old Faithful: Is located in Yellowstone National Park.; It was named in 1870.

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Old Faithful: Is located in Yellowstone National Park.; It was named in 1870.

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Glacier National Park: The park is home to 26 glaciers.; Mountain goats are a symbol of the national park.

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Glacier National Park: The park is home to 26 glaciers.; Mountain goats are a symbol of the national park.

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A portion of a ocean or sea enclosed by land.

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A portion of a ocean or sea enclosed by land.

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Gulf of Oman: 12,119 feet deep.; There are fiver islands in the gulf of oman.

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Gulf of Oman: 12,119 feet deep.; There are fiver islands in the gulf of oman.

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Grindslow Knoll: The elevation is 1,972 feet high.; Is located in Peak District National Park Derbyshire, England.

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Grindslow Knoll: The elevation is 1,972 feet high.; Is located in Peak District National Park Derbyshire, England.

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Ice Island: Located near Antarctica.; Between 1952 and 1978 it was used as a manned scientific drift station that included huts, a power plant, and a runway for wheeled aircraft.   

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Ice Island: Located near Antarctica.; Between 1952 and 1978 it was used as a manned scientific drift station that included huts, a power plant, and a runway for wheeled aircraft.   

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Mindanao: The area is 37,657 square miles.; The population is 27, 021, 036.

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Mindanao: The area is 37,657 square miles.; The population is 27, 021, 036.

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A narrow part of an island bordered with both sides of water.

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A narrow part of an island bordered with both sides of water.

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Isthmus of Panama: Also known as Isthmus of Darien.; It lies between the Caribbean Sea and Pacific Ocean.

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Isthmus of Panama: Also known as Isthmus of Darien.; It lies between the Caribbean Sea and Pacific Ocean.

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A wild land overgrown with dense vegetation.

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A wild land overgrown with dense vegetation.

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Lacandon Jungle: The Lacandon is one of the most biodiverse rainforests in the world, with as much as 25% of Mexico's total species diversity.; The area is 1,280 square miles.

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Lacandon Jungle: The Lacandon is one of the most biodiverse rainforests in the world, with as much as 25% of Mexico's total species diversity.; The area is 1,280 square miles.

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An area of shallow water separated from the sea by low sandy dunes.

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An area of shallow water separated from the sea by low sandy dunes.

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Stone Lagoon: It is located between Trinidad to the south and Orick.; Stone Lagoon is the second of three similar lagoons within Humboldt Lagoons State Park.

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Stone Lagoon: It is located between Trinidad to the south and Orick.; Stone Lagoon is the second of three similar lagoons within Humboldt Lagoons State Park.

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A body of fresh or salt water of considerable size, surrounded by land.

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A body of fresh or salt water of considerable size, surrounded by land.

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Devils Lake: The lake is 30 feet deep.; The area is 368 acres.

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Devils Lake: The lake is 30 feet deep.; The area is 368 acres.

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Everglades National Park: Everglades National Park is a 1.5-million-acre wetlands.; The area is 7,800 square miles.

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Everglades National Park: Everglades National Park is a 1.5-million-acre wetlands.; The area is 7,800 square miles.

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A natural elevation of earth's surface rising to a summit.

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A natural elevation of earth's surface rising to a summit.

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Rocky Mountain National Park: Rocky Mountain National Park in northern Colorado spans the Continental Divide and encompasses protected mountains.; The rocky mountains are home to a supervolcano.

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Rocky Mountain National Park: Rocky Mountain National Park in northern Colorado spans the Continental Divide and encompasses protected mountains.; The rocky mountains are home to a supervolcano.

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Atlantic Ocean: The second largest of the world's oceans.; It covers approximately 20% of Earth's surface.

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Atlantic Ocean: The second largest of the world's oceans.; It covers approximately 20% of Earth's surface.

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An area of land almost completely surrounded by water.

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An area of land almost completely surrounded by water.

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Avalon Peninsula: The Avalon Peninsula is a large peninsula that makes up the southeast portion of the island of Newfoundland.; The peninsula is home to 262,411 people.

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Avalon Peninsula: The Avalon Peninsula is a large peninsula that makes up the southeast portion of the island of Newfoundland.; The peninsula is home to 262,411 people.

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An area of land not significantly higher than surrounding areas.

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An area of land not significantly higher than surrounding areas.

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A flat, elevated landform that rises sharply above the surrounding area on at least one side.

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A flat, elevated landform that rises sharply above the surrounding area on at least one side.

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The salt waters that cover the greater part of the earth's surface.

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The salt waters that cover the greater part of the earth's surface.

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Great Plains: The area is about 1,125,000 square miles.; The highest point is Fishers Peak Mesa.

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Great Plains: The area is about 1,125,000 square miles.; The highest point is Fishers Peak Mesa.

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Colorado Plateau: The plateau is dominated by high mountains that are gashed by river canyons.; The size is 240,000 square miles.

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Colorado Plateau: The plateau is dominated by high mountains that are gashed by river canyons.; The size is 240,000 square miles.

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Mississippi River: Is the second-longest river in North America.; The length is 2,318 miles.

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Mississippi River: Is the second-longest river in North America.; The length is 2,318 miles.

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Caribbean Sea: The Caribbean Sea is home to the second-largest barrier reef in the world.; It is 7,218 feet deep.

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Caribbean Sea: The Caribbean Sea is home to the second-largest barrier reef in the world.; It is 7,218 feet deep.

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A narrow passage of water connecting to large bodies of water.

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A narrow passage of water connecting to large bodies of water.

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Strait of Hormuz: The depth is 262 feet.; This strait is short in length, but it is around twenty-one miles wide at its most narrow point.

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Strait of Hormuz: The depth is 262 feet.; This strait is short in length, but it is around twenty-one miles wide at its most narrow point.

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Big Cypress National Preserve: Established in 1974.; The area is 720,566 acres.

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Big Cypress National Preserve: Established in 1974.; The area is 720,566 acres.

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Interior Yukon-Alaska Alpine Tundra: The area is 90,028 square miles.; Moose, red foxes, wolves, grizzly bear, and rabbits live there.

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Interior Yukon-Alaska Alpine Tundra: The area is 90,028 square miles.; Moose, red foxes, wolves, grizzly bear, and rabbits live there.

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A depression between hills or mountains.

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A depression between hills or mountains.

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Waipio Valley: The elevation gain is about 975 feet.; Waipio means "curved river."

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Waipio Valley: The elevation gain is about 975 feet.; Waipio means "curved river."

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A vent in the Earth's crust which lava erupt out of.

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A vent in the Earth's crust which lava erupt out of.

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Mauna Loa: Mauna Loa is one of five volcanoes that form the Island of Hawaii.; The last eruption happened in 1984.

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Mauna Loa: Mauna Loa is one of five volcanoes that form the Island of Hawaii.; The last eruption happened in 1984.

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Yosemite Falls: The elevation is 5,404 feet.; The height is 2,425.

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Yosemite Falls: The elevation is 5,404 feet.; The height is 2,425.