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A U.S.purchase of oil from overseas paid for with foreign currency it already owned
Iridium
A very hard, brittle, silvery-white transition metal of the platinum group, often used in high-strength alloys.
K-Pg Boundary
The geological signature marking the end of the Cretaceous period and the beginning of the Paleogene, associated with the mass extinction event that killed the dinosaurs.
Meteorite Impact
A phenomenon where a meteoroid enters Earth's atmosphere and collides with the Earth's surface, potentially causing significant ecological and geological changes.
Embryonic Development
The process by which an embryo forms and develops, starting from a single fertilized cell through to a multi-cellular organism, involving cell division, differentiation, and morphogenesis.
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