Which are bigger—Celsius degrees or Fahrenheit degrees?
a. Fahrenheit
b. Celsius
c. Neither—they are the same size.
d. This is a nonsensical comparison.
b
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Where did the cosmic microwave background (CMB) come from?
a. Photons emitted from the first stars b. Photons released from hydrogen in our galaxy c. Light scattered by dust in our Solar System d. Photons released when electrons and nuclei combined for the first time.
The first-quarter Moon rises
a. at about noon. b. at sunset. c. at sunrise. d. at about midnight. e. during the second week of each calendar month.
Valley networks are located in Mars's northern hemisphere
Indicate whether the statement is true or false
The correct sequence of spectral type letters from hot on the left to cool on the right is
a. M, K, G, F, A, B, O b. O, B, A, F, G, K, M c. G, K, M, F, O, B, A d. A, B, O, F, G, K, M