Like the Sun and the Moon, the planets appear to move from west to east from one day to the next
Indicate whether the statement is true or false
TRUE
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What is the stratosphere?
A. the uppermost layer of the atmosphere B. the layer of the atmosphere containing the ozone layer C. the layer of the atmosphere where the weather we experience is located D. the layer of the atmosphere containing the aurora E. None of these choices are correct.
The Sun's location in the Milky Way Galaxy is
A) very near the galactic center. B) in the halo of the galaxy, about 28,000 light-years above the galactic disk. C) at the very outer edge of the galactic disk. D) in the galactic disk, roughly halfway between the center and the outer edge of the disk.
The main problem with early attempts to listen for radio signals from space was
A) that they were conducted at relatively low frequencies which have problems penetrating the Earth's upper atmosphere B) building receivers sensitive enough to detect extraterrestrial signals C) that they were conducted at relatively high frequencies which have problems penetrating the Earth's lower atmosphere D) interference by radio waves from the Sun
What would be the best explanation for the fact that most natural water has a pH of about 5.6?
A) Carbon dioxide reacts with water to form an acid. B) Air contains acid rain particles. C) Minerals that are dissolved in water are often acidic. D) Many salts that dissolve in natural waters make the water basic. E) none of the above