Nuclear power plants on Earth generate energy through _____
A) nuclear fission reactions
B) nuclear fusion reactions
C) nuclear convection reactions
D) nuclear evaporation reactions
A
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Which of the following occurs during an El Niño year?
A) Fishing catches improve along the South American coast. B) Cold water upwelling increases. C) The Trade winds become stronger. D) Storms increase on the western side of the Pacific.
The spreading of different wavelengths of light due to slightly different indices of refraction is known as
A. Refraction B. Dispersion C. Immersion D. Total internal reflection
The luminosity of the Sun is about 4 x 1015watts (joules per second)
Indicate whether the statement is true or false
By studying distant galaxies in the 1920s, Hubble made the following important discovery that led us to conclude that the universe is expanding
A) All galaxies contain billions of stars, and all galaxies have spiral shapes. B) All galaxies outside the Local Group are moving away from us, and the farther away they are, the faster they're going. C) All galaxies were born at the same time, and all will die at the same time. D) All galaxies outside the Local Group are orbiting the Local Group. E) All galaxies outside the Local Group are moving away from us, and all are moving away at nearly the same speed.