Which happens as part of the convection cycle in Earth's atmosphere? A. hot, denser air rises
B. cold, denser air falls
C. hot, less less dense air falls
D. Cold, less dense air falls

The soviet union beat the us to the first successful launch, with the october 4, 1957, orbiting of sputnik 1, and later beat the us to have the first human in earth orbit, yuri gagarin, on april 12, 1961. the "race" peaked with the july 20, 1969, us landing of the first humans on the moon with apollo 11

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