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24. During the course of a year and relative to the Sun, Earth’s axis 33. In the time 1 p.m., the p.m. means
points a. “past morning.”
a. always toward the Sun. b. “past midnight.”
b. toward the Sun half of the year and away from the Sun the c. “before the meridian.”
other half. d. “after the meridian.”
c. always away from the Sun. 34. Clock time is based on
d. toward the Sun for half a day and away from the Sun the a. sundial time.
other half. b. an averaged apparent solar time.
25. If you are located at 20°N latitude, when will the Sun appear c. the apparent local solar time.
directly overhead? d. the apparent local noon.
a. Never 35. An apparent solar day is
b. Once a year a. the interval between two consecutive local solar noons.
c. Twice a year b. about 4 minutes longer than the sidereal day.
d. Four times a year c. of variable length throughout the year.
26. If you are located on the equator (0° latitude), when will the Sun d. All of the above are correct.
appear directly overhead? 36. The time as read from a sundial is the same as the time read
a. Never from a clock
b. Once a year a. all the time.
c. Twice a year b. only once a year.
d. Four times a year c. twice a year.
27. If you are located at 40°N latitude, when will the Sun appear d. four times a year.
directly overhead? 37. You are traveling west by jet and cross three time zone
a. Never boundaries. If your watch reads 3 p.m. when you arrive, you
b. Once a year should reset it to
c. Twice a year a. 12 noon.
d. Four times a year b. 6 p.m.
28. During the equinoxes c. 12 midnight.
a. a vertical stick in the equator will not cast a shadow at noon. d. 6 a.m.
b. at noon the Sun is directly overhead at 0° latitude. 38. If it is Sunday when you cross the international date line while
c. daylight and night are of equal length. traveling westward, the next day is
d. All of the above are correct. a. Wednesday.
29. Evidence that Earth is rotating is provided by b. Sunday.
a. varying length of night and day during a year. c. Tuesday.
b. seasonal climatic changes. d. Saturday.
c. stellar parallax. 39. What has happened to the surface of the Moon during the last
d. a pendulum. 3 billion years?
30. In about 12,000 years, the star Vega will be the North Star, not a. Heavy meteorite bombardment, producing craters
Polaris, because of Earth’s b. Widespread lava flooding from the interior
a. uneven equinox. c. Both widespread lava flooding and meteorite bombardment
b. tilted axis. d. Not much
c. precession. 40. If you see a full moon, an astronaut on the Moon looking back at
d. recession. Earth at the same time would see a
31. The significance of the tropic of Cancer (23.5°N latitude) is that a. full Earth.
a. the Sun appears directly overhead north of this latitude some b. new Earth.
time during a year. c. first quarter Earth.
b. the Sun appears directly overhead south of this latitude some d. last quarter Earth.
time during a year. 41. A lunar eclipse can occur only during the moon phase of
c. the Sun appears above the horizon all day for six months a. full moon.
during the summer north of this latitude. b. new moon.
d. the Sun appears above the horizon all day for six months c. first quarter.
during the summer south of this latitude. d. last quarter.
32. The significance of the Arctic Circle (66.5°N latitude) is that 42. A total solar eclipse can occur only during the moon
a. the Sun appears directly overhead north of this latitude phase of
sometime during a year. a. full moon.
b. the Sun appears directly overhead south of this latitude b. new moon.
sometime during a year. c. first quarter.
c. the Sun appears above the horizon all day at least one day d. last quarter.
during the summer.
d. the Sun appears above the horizon all day for six months
during the summer.

16-25 CHAPTER 16 Earth in Space 429