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Earth Science
Chapter 27
Worksheet 1
Name ____________________________
Block ____________________________
Match the definitions to the correct word or term
A. Time of year during which Earth’s axis is at a 90O angle to the
Sun
B. Furthest point in the Moon’s elliptical orbit to Earth
C. Closest point in the Moon’s elliptical orbit to Earth
D. When the Moon passes between Earth and the Sun, blocking
Earth’s view of the Sun
____
1. Lunar eclipse
____
____
____
2. Regolith
3. Interferometry
4. Ecliptic plane
____
5. Albedo
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6. Electromagnetic spectrum
____
7. Apogee
____
____
8. Rille
9. Reflecting telescope
H. Telescope that uses lenses to focus visible light
I. Material that falls back to the lunar surface after being
blasted out by the impact of a space object
____
____
____
10. Solstice
11. Highland
12. Refracting telescope
J. Dark-colored, smooth plains on the Moon surface
K. Long trail of ejecta that radiates outward from a Moon crater
L. All types of electromagnetic radiation arranged according to
wavelength and frequency
____
13. Perigee
M. Period when the Sun is overhead at its farthest distance
either north or south of the equator
____
14. Ray
N. Percentage of sunlight that is reflected by the surface of a
planet or satellite
____
____
15. Equinox
16. Maria
O. Layer of loose, ground-up rock on the lunar surface
P. Valleylike structure that meanders across some regions of
the Moon’s surface
____
17. Solar eclipse
Q. Light-colored, mountainous, heavily crated area of the Moon,
composed mostly of lunar breccias
____
18. Ejecta
R. Process that links separate telescopes so they act as one,
producing more detailed images
____
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19. Synchronous rotation
20. Impact crater
S. Telescope that uses mirrors to focus visible light
T. Plane of Earth’ orbit around the Sun
E. Crater formed when space material impacted on Moon’s
surface
F. The state at which the Moon’s orbital and rotational periods
are equal
G. When Earth passes between the Sun and the Moon, and
Earth’s shadow falls on the Moon
Circle the letter that corresponds to the correct answer
21. Which is the highest point in the sky that the Sun reaches on a given day?
a. Ecliptic
b. Solstice
c. Tropic
d. Zenith
22. Which type of electromagnetic radiation has a longer wavelength than visible light
a. Gamma ray
b. X-ray
c. Radio wave
d. Ultraviolet ray
23. Which geographic features on the Moon are most likely to be the oldest?
a. Craters
b. Highlands
c. Maria
d. Regolith
24. What is the mineral composition of most moon rocks?
a. Basalts containing water
b. Feldspar with high iron content
c. Sedimentary breccias
d. Silicates
25. Which layer of the Moon is partially molten?
a. Core
b. Lower mantle
c. Upper mantle
d. Crust
26. Which layer of the Moon is probably solid iron?
a. Core
b. Lower mantle
c. Upper mantle
d. Crust
27. Which of the following best describes an impact basin?
a. The white glow around the edges of the Moon
b. A round, three-dimensional object
c. The hollow left behind by an object striking the Moon
d. An elongated, closed curve
28. Which theory do scientists think best accounts for the similarity of age and composition between the
Moon and Earth?
a. Earth formed before the Moon
b. The Moon formed before Earth
c. Earth and the Moon formed at about the same time from dust and gas
d. The Moon was once part of Earth and broke away as a result of a large impact
29. Which of the following is caused by Earth’s rotation?
a. The year
b. Day and night
c. The seasons
d. Earth’s tilt
30. Which factor is one cause of the difference in the noontime altitude of the Sun on June 21 and
December 21?
a. The tilt of Earth’s axis
b. The Sun’s apparent diameter
c. Earth’s changing distance from the Sun
d. The Sun’s period of rotation
31. What causes tides?
a. Gravitational attraction of the Moon and the Sun
b. Rotation of the Moon on it axis
c. Movement of the tectonic plates
d. The Coriolis effect
Answer the following questions
32. Distinguish between reflecting and refracting telescopes.
33. Examine the reasons why astronomers send telescopes and probes into space.
34. Assess the benefits of technology spinoffs to society.
35. Classify the following according to age: maria, highlands, and rilles.
36. Distinguish the steps involved in the impact theory of lunar formation.
37. Compare solar and lunar eclipses, including the positions of the Sun, Earth, and Moon.
38. What would seasons be like if Earth were not tilted on its axis?
39. Would ocean tides exist if Earth had no moon? If so, describe what they would be like