Until the 20th Century, the nutrient element only came to Earth in a reactive form that is usable by plants and animals, thanks to certain microbes in soil and water (and to a smaller extent in lightning strikes).
Both soon came down to earth, so that their approval ratings were slightly below 50% by re-election day.
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He became infuriated that he could not bring me to accept what he believes to be pure fact, as supposedly revealed in ancient Sumerian tablets: that this mysterious planet is populated by beings who in the past came down to Earth, mingled with human beings and, by implanting us with their stellar DNA, kick-started us down the road to civilization.
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The biggest losers of the NFL settlement, meanwhile, were the high first round picks whose lofty contracts came back down to earth in 2011.
Younes El Aynaoui came back down to earth after his Australian Open heroics as he was knocked out by Italian veteran Andrea Gaudenzi in Milan.
On April 22, 1970, millions of Americans came together to celebrate the first Earth Day.
Stewart Brand, the 78-year-old technologist who came to fame as editor of "The Whole Earth Catalog, " introduced an ambitious plan to recreate extinct species, using DNA from museum specimens.
It sounds like something out of a movie, but that's what it came down to as Apollo 11 sped back towards Earth after landing on the moon in 1969.
However, the team still has to determine whether the carbon was native to Mars or it came with Curiosity from here on Earth.
We need Congress to develop a legal system and technology to pump CO2 back into the earth where it came from.
When The Times of London recently asked its readers to vote for the greatest novels of the last 60 years, Follett's The Pillars of the Earth came in at No. 2 (just behind To Kill a Mockingbird).
Like the Jews, the Muslims came to see the Rock as a meeting point between God and Man, the centre of the earth, the origin of all fertility.
We came together to reclaim the basic bargain that built the largest middle class and the most prosperous nation on Earth.
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This came as a big surprise to those of us who assumed such events were produced by natural collisions of constantly shifting Earth tectonic plates.
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