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1. Which of the following geologic processes makes scientists think that liquid water may have once existed on Mars?
A deposition of sediment
Chapter 21
CRCT Preparation
1. Which of the following geologic processes makes scientists think that liquid water may have once existed on Mars?
A deposition of sediment
2. Which of the following is a characteristic of comets?
A Comets are composed of rocky material, iron, and nickel.
B Comets follow a circular orbit around the sun.
C Comets give off gas and dust when heated by the sun.
D Comets are rich in iron.
Chapter 21
CRCT Preparation
2. Which of the following is a characteristic of comets?
A Comets are composed of rocky material, iron, and nickel.
B Comets follow a circular orbit around the sun.
C Comets give off gas and dust when heated by the sun.
D Comets are rich in iron.
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3. Scientists observe a planet in a distant galaxy. This planet appears to have similar features to Earth. Which feature would the scientists be most interested in, if they were looking for life on this planet?
A thick atmosphere
B liquid water
C active volcanoes
Chapter 21
CRCT Preparation
3. Scientists observe a planet in a distant galaxy. This planet appears to have similar features to Earth. Which feature would the scientists be most interested in, if they were looking for life on this planet?
A thick atmosphere
B liquid water
C active volcanoes
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4. According the data in the table, which outer planet takes 30,660 Earth days to complete one orbit around the sun?
A Jupiter C Uranus
B Saturn D Neptune
Chapter 21
CRCT Preparation
4. According the data in the table, which outer planet takes 30,660 Earth days to complete one orbit around the sun?
A Jupiter C Uranus
B Saturn D Neptune
Chapter 21
CRCT Preparation
5. Based on the table, which of the following is a valid conclusion?
A In general, each outer planet is about twice as far from the sun as the next closest planet.
B Each period of revolution is unrelated to the average distance of each planet from the sun.
C Among the outer planets, planets with the largest volume are found farthest from the sun.
D Day length for each planet increases with an increase in the planet’s diameter.
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Chapter 21
CRCT Preparation
5. Based on the table, which of the following is a valid conclusion?
A In general, each outer planet is about twice as far from the sun as the next closest planet.
B Each period of revolution is unrelated to the average distance of each planet from the sun.
C Among the outer planets, planets with the largest volume are found farthest from the sun.
D Day length for each planet increases with an increase in the planet’s diameter.
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6. Which one of the following objects in our solar system would travel the greatest distance during one revolution around the sun?
A a terrestrial planet
Chapter 21
CRCT Preparation
6. Which one of the following objects in our solar system would travel the greatest distance during one revolution around the sun?
A a terrestrial planet
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7. The distance from Earth to the sun is 1 astronomical unit (AU), or 8.3 light-minutes. If Saturn is located about 9.4 AU away from the sun, how many light-hours from the sun is it?
A 0.3 light-hours
B 1.3 light-hours
C 17.7 light-hours
D 78.0 light-hours
Chapter 21
CRCT Preparation
7. The distance from Earth to the sun is 1 astronomical unit (AU), or 8.3 light-minutes. If Saturn is located about 9.4 AU away from the sun, how many light-hours from the sun is it?
A 0.3 light-hours
B 1.3 light-hours
C 17.7 light-hours
D 78.0 light-hours
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8. The diagram shows different positions of the moon relative to Earth and the sun. In which phase will an observer on Earth see a crescent moon?
A phase A C phase C
B phase B D phase D
Chapter 21
CRCT Preparation
Chapter 21
CRCT Preparation
8. The diagram shows different positions of the moon relative to Earth and the sun. In which phase will an observer on Earth see a crescent moon?
A phase A C phase C
B phase B D phase D
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9. Which of the following is a wide region of small, rocky bodies that is located between the orbits of Mars and Jupiter?
A the Kuiper belt
B the Oort cloud
C the asteroid belt
Chapter 21
CRCT Preparation
Chapter 21
CRCT Preparation
9. Which of the following is a wide region of small, rocky bodies that is located between the orbits of Mars and Jupiter?
A the Kuiper belt
B the Oort cloud
C the asteroid belt
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10. Which of the following motions of Earth and the moon occurs in the longest period of time?
A Earth orbits the sun once.
B The moon orbits Earth twice.
C Earth rotates on its axis five times.
D Twelve full moons are seen from Earth.
Chapter 21
CRCT Preparation
Chapter 21
CRCT Preparation
10. Which of the following motions of Earth and the moon occurs in the longest period of time?
A Earth orbits the sun once.
B The moon orbits Earth twice.
C Earth rotates on its axis five times.
D Twelve full moons are seen from Earth.
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11. The full moon occurs on Wednesday, January 3rd. On what day could a lunar eclipse occur during January?
A Wednesday the 3rd
B Thursday the 11th
C Thursday the 18th
D Thursday the 25th
Chapter 21
CRCT Preparation
11. The full moon occurs on Wednesday, January 3rd. On what day could a lunar eclipse occur during January?
A Wednesday the 3rd
B Thursday the 11th
C Thursday the 18th
D Thursday the 25th
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12. In 2006, Pluto was reclassified as a dwarf planet. What are the characteristics of Pluto that make it similar to and different from the planets in our solar system?
Chapter 21
CRCT Preparation
12. Answer - Full-credit answers should include the following points:
• Pluto is similar to the planets because: it orbits the sun and has a satellite; it is rocky, like the terrestrial planets, and it has a thin atmosphere; and it is round because of its own gravity.
• Pluto is different because: it is much smaller than the planets; its satellite is more than half the size of Pluto, while satellites around planets in our solar system are much smaller than their planets; it is made of rock and ice, like a comet; and it has not cleared its orbit of debris.
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13. Carrie explained to her little brother that a solar eclipse happens when the full moon blocks the sun. Was she correct? Explain your answer.
Chapter 21
CRCT Preparation
13. Answer - Full-credit answers should include the following points:
• Carrie was correct when she implied that a solar eclipse happens when the moon is directly between Earth and the sun.
• However, because of its relative position in the sky when the moon