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The cap is cut by canyons and troughs that plunge as deep as one kilometre beneath the surface.
BBC: By BBC News Online Science Editor Dr David Whitehouse
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The cap has an average thickness of one kilometre and covers an area 1.5 times the size of Texas.
BBC: By BBC News Online Science Editor Dr David Whitehouse
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The Russian looked like he might win the final stage as well but with rain starting to fall he crashed with one kilometre remaining.
BBC: Menchov wins Giro despite crash
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The scheme includes one kilometre of embankment and provides flood protection for Keadby Power Station, three sewage treatment works, two railway lines and three stations, the A614, the A616 and the M18 motorway.
BBC: Largest flood scheme in Yorkshire completed
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"If we find the parachute we will know that the lander is no more than a kilometre away because if everything went right the two would have separated one kilometre above the surface and there wouldn't be much distance between them when they came down, " he said.
BBC: Mars probe canyon crash theory
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The population density in the Russian Far East is barely one person per square kilometre.
ECONOMIST: Russia does not exactly soar in its Asian backyard
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To take one example, a kilometre from the Bagram airbase, and just off the main road, a crowd gathered recently as the bodies of three Afghan soldiers were carefully dragged clear.
ECONOMIST: Now the country's fragile peace must be made to stick
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For example, public transport is expensive: a one-way ten-kilometre (six-mile) train ride from suburban Oslo into the city costs NKr26, which is twice as much as the road toll.
ECONOMIST: Excessive
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Its two satellites, flying half a kilometre apart, will communicate with one another using laser telemetry.
ECONOMIST: Birds of a feather
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The BSF kills with such impunity along India's 4, 100-kilometre (2, 550-mile) border with Bangladesh that one local journalist wonders what the story is about.
ECONOMIST: India��s shoot-to-kill policy claims one more innocent
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There are more than 6, 000 people to every square kilometre and there can be days when it sounds as if every one of them is talking at the same time.
BBC: Hong Kong: Where worlds collide
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Mogadishu-born Mo Farah became one of Team GB's pre-eminent heroes with his storming 10, 000 kilometre finish.
BBC: An Olympian spirit of generosity