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How does one date Planet Earth? How old is the earth, and how do scientists figure out the age of rocks? Geochronologist, Dr. Matt Heizler from the New…
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Sat 2/20, 9a: What's out of this world but right on this planet? Martian meteorites! This week on The Children's Hour, Zoltan Vaci from the Institute of…
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Fiery eruptions, titanic floods, the grinding of great ice sheets, and massive impacts from space all shaped North America. This month, NOVA presents…