A block has a storage capacity, and once it's used up, it can be closed and linked to a previously served block.
A piece of insulating foam on Columbia's fuel tank broke loose during launch, damaging the heat shield with devastating results.
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In Trump's eyes it is a big business opportunity for the US oil sector. "We're going to be extracting numbers in terms of oil like few people have seen," he said at a news conference in mid-January, after a meeting with energy bosses at the White House.
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