Chapter 21 Test

MULTIPLE CHOICE
-Choose the correct answer by clicking on your answer choice. Only one answer is correct. (2 pts. each)

2

To which of the two main groups of planets does Earth belong?

2

What tool made possible the discovery of additional planets?

2

A common method for scientists to measure distances within the solar system is to use

2

What evidence suggests that Mars once had a warmer climate?

2

Which terrestrial planet has a day that is over two Earth months long?

2

Why is Venus sometimes called Earth's twin?

2

What is one factor that makes life possible on Earth?

2

What does the extra energy that Saturn gives off suggest about the planet?

2

Why is the planet Uranus considered a gas giant?

2

What is unusual about Pluto's moon Charon?

2

What evidence supports the current theory about our moon's origin?

2

What causes the phases of the moon?

2

What happens during a total solar eclipse?

2

Why do planets or moons with atmospheres have fewer impacts?

2

What is the main difference between an asteriod and a meteoroid?

2

Why are the inner planets called terrestrial planets?

2

What is the most useful unit for measuring distances within the solar system?

2

Why do active planets generally have fewer impacts than bodies like the moon?

2

What is one way that gas giants differ from the terrestrial planets?

2

What is the evidence that Mars once had liquid water?

2

Which of the following is evidence that Pluto is not a gas giant?

2

Which of these average distances is the astronomical unit based on?

2

How do gas giants differ from terrestrial planets?

Use the diagram below to answer questions 24 and 25.

2

Which number represents the orbit of Venus?

2

Beyond what numbered orbit are the comets of the Kuiper belt found?

Completion
 - Complete the following questions by selecting the correct word from the word bank. Misspelled words will be marked as incorrect. Some answers may be used more than once, others may not be used at all. (2 pts. each)

Word Bank

Earth    Mars      Jupiter      Venus      meteorite(s)       prograde motion       retrograde motion      asteriod(s)           gas giant     retrograde      prograde      terrestrial planets      comet(s)      meteor(s)       satellite(s)        phases                         solar eclipse       lunar eclipse      period of rotation      period of revolution      

2

_______________ are meteoroids that fall to Earth.

Word Bank

Earth    Mars      Jupiter      Venus      meteorite(s)       prograde motion       retrograde motion      asteriod(s)           gas giant     retrograde      prograde      terrestrial planets      comet(s)      meteor(s)       satellite(s)        phases                         solar eclipse       lunar eclipse      period of rotation      period of revolution      

2

Most asteriods in our solar system are found between _ and ___.

Word Bank

Earth    Mars      Jupiter      Venus      meteorite(s)       prograde motion       retrograde motion      asteriod(s)           gas giant     retrograde      prograde      terrestrial planets      comet(s)      meteor(s)       satellite(s)        phases                         solar eclipse       lunar eclipse      period of rotation      period of revolution      

2

The counterclockwise spin of a planet or moon as seem from above the planet's North Pole is _________________.

Word Bank

Earth    Mars      Jupiter      Venus      meteorite(s)       prograde motion       retrograde motion      asteriod(s)           gas giant     retrograde      prograde      terrestrial planets      comet(s)      meteor(s)       satellite(s)        phases                         solar eclipse       lunar eclipse      period of rotation      period of revolution      

2

Unlike most planets, Venus has a(n) __________________ rotation, which means that it appears to spin in a clockwise direction.

Word Bank

Earth    Mars      Jupiter      Venus      meteorite(s)       prograde motion       retrograde motion      asteriod(s)           gas giant     retrograde      prograde      terrestrial planets      comet(s)      meteor(s)       satellite(s)        phases                         solar eclipse       lunar eclipse      period of rotation      period of revolution      

2

A meteoroid is called a(n) ___________________ only after it has struck Earth's surface.

Word Bank

Earth    Mars      Jupiter      Venus      meteorite(s)       prograde motion       retrograde motion      asteriod(s)           gas giant     retrograde      prograde      terrestrial planets      comet(s)      meteor(s)       satellite(s)        phases                         solar eclipse       lunar eclipse      period of rotation      period of revolution      

2

The inner planets of our solar system are called ________________________.

Word Bank

Earth    Mars      Jupiter      Venus      meteorite(s)       prograde motion       retrograde motion      asteriod(s)           gas giant     retrograde      prograde      terrestrial planets      comet(s)      meteor(s)       satellite(s)        phases                         solar eclipse       lunar eclipse      period of rotation      period of revolution      

2

Some scientists refer to _______________ as "dirty snowballs" because they are composed of ice, rock and cosmic dust.

Word Bank

Earth    Mars      Jupiter      Venus      meteorite(s)       prograde motion       retrograde motion      asteriod(s)           gas giant     retrograde      prograde      terrestrial planets      comet(s)      meteor(s)       satellite(s)        phases                         solar eclipse       lunar eclipse      period of rotation      period of revolution      

2

When the Earth's shadow falls on the moon, a ________________ occurs.

Word Bank

Earth    Mars      Jupiter      Venus      meteorite(s)       prograde motion       retrograde motion      asteriod(s)           gas giant     retrograde      prograde      terrestrial planets      comet(s)      meteor(s)       satellite(s)        phases                         solar eclipse       lunar eclipse      period of rotation      period of revolution      

2

The amount of time an object takes to orbit around another body once is its ____________________.

Word Bank

Earth    Mars      Jupiter      Venus      meteorite(s)       prograde motion       retrograde motion      asteriod(s)           gas giant     retrograde      prograde      terrestrial planets      comet(s)      meteor(s)       satellite(s)        phases                         solar eclipse       lunar eclipse      period of rotation      period of revolution      

2

The amount of time an object takes to rotate once is its _____________________.

Word Bank

Earth    Mars      Jupiter      Venus      meteorite(s)       prograde motion       retrograde motion      asteriod(s)           gas giant     retrograde      prograde      terrestrial planets      comet(s)      meteor(s)       satellite(s)        phases                         solar eclipse       lunar eclipse      period of rotation      period of revolution      

2

The different appearences of the moon are called __________________.

Word Bank

Earth    Mars      Jupiter      Venus      meteorite(s)       prograde motion       retrograde motion      asteriod(s)           gas giant     retrograde      prograde      terrestrial planets      comet(s)      meteor(s)       satellite(s)        phases                         solar eclipse       lunar eclipse      period of rotation      period of revolution      

2

When the moon's shadow falls on part of the Earth, a ____________________ occurs.

Word Bank

Earth    Mars      Jupiter      Venus      meteorite(s)       prograde motion       retrograde motion      asteriod(s)           gas giant     retrograde      prograde      terrestrial planets      comet(s)      meteor(s)       satellite(s)        phases                         solar eclipse       lunar eclipse      period of rotation      period of revolution      

2

Frozen bodies made of ice, rock and dust are called _____________________.

Word Bank

Earth    Mars      Jupiter      Venus      meteorite(s)       prograde motion       retrograde motion      asteriod(s)           gas giant     retrograde      prograde      terrestrial planets      comet(s)      meteor(s)       satellite(s)        phases                         solar eclipse       lunar eclipse      period of rotation      period of revolution      

2

Small, rocky bodies that revolve around the sun are called _____________________.

Word Bank

Earth    Mars      Jupiter      Venus      meteorite(s)       prograde motion       retrograde motion      asteriod(s)           gas giant     retrograde      prograde      terrestrial planets      comet(s)      meteor(s)       satellite(s)        phases                         solar eclipse       lunar eclipse      period of rotation      period of revolution      

2

Bright streaks of light that result when rocky bodies burn up are called ____________________.

Matching
 - Complete the following matching questions by clicking on the correct answer. Only one answer is correct. (2 pts. each)

2

Contains the five planets farthest from the sun.

2

A group of very large planets that are composed mainly of gases.

2

Contains the four planets that are located closest to the sun.

2

A unit of measurement based on the average distance between Earth and the sun.

2

A group of planets whose surfaces are hard and rocky.

2

This planet is known for its spectacular ring system.

2

This planet's year is only 88 Earth days long.

2

This planet had a storm system called the Great Dark Spot.

2

This is the only planet known to contain life as we know it.

2

This inner planet spins with a retrograde motion.

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Chapter 21 Test

To which of the two main groups of planets does Earth belong?

What tool made possible the discovery of additional planets?

A common method for scientists to measure distances within the solar system is to use

What evidence suggests that Mars once had a warmer climate?

Which terrestrial planet has a day that is over two Earth months long?

Why is Venus sometimes called Earth's twin?

What is one factor that makes life possible on Earth?

What does the extra energy that Saturn gives off suggest about the planet?

Why is the planet Uranus considered a gas giant?

What is unusual about Pluto's moon Charon?

What evidence supports the current theory about our moon's origin?

What causes the phases of the moon?

What happens during a total solar eclipse?

Why do planets or moons with atmospheres have fewer impacts?

What is the main difference between an asteriod and a meteoroid?

Why are the inner planets called terrestrial planets?

What is the most useful unit for measuring distances within the solar system?

Why do active planets generally have fewer impacts than bodies like the moon?

What is one way that gas giants differ from the terrestrial planets?

What is the evidence that Mars once had liquid water?

Which of the following is evidence that Pluto is not a gas giant?

Which of these average distances is the astronomical unit based on?

How do gas giants differ from terrestrial planets?

Which number represents the orbit of Venus?

Beyond what numbered orbit are the comets of the Kuiper belt found?

_______________ are meteoroids that fall to Earth.

Most asteriods in our solar system are found between ___________________ and _____________________.

The counterclockwise spin of a planet or moon as seem from above the planet's North Pole is _________________.

Unlike most planets, Venus has a(n) __________________ rotation, which means that it appears to spin in a clockwise direction.

A meteoroid is called a(n) ___________________ only after it has struck Earth's surface.

The inner planets of our solar system are called ________________________.

Some scientists refer to _______________ as "dirty snowballs" because they are composed of ice, rock and cosmic dust.

When the Earth's shadow falls on the moon, a ________________ occurs.

The amount of time an object takes to orbit around another body once is its ____________________.

The amount of time an object takes to rotate once is its _____________________.

The different appearences of the moon are called __________________.

When the moon's shadow falls on part of the Earth, a ____________________ occurs.

Frozen bodies made of ice, rock and dust are called _____________________.

Small, rocky bodies that revolve around the sun are called _____________________.

Bright streaks of light that result when rocky bodies burn up are called ____________________.

Contains the five planets farthest from the sun.

A group of very large planets that are composed mainly of gases.

Contains the four planets that are located closest to the sun.

A unit of measurement based on the average distance between Earth and the sun.

A group of planets whose surfaces are hard and rocky.

This planet is known for its spectacular ring system.

This planet's year is only 88 Earth days long.

This planet had a storm system called the Great Dark Spot.

This is the only planet known to contain life as we know it.

This inner planet spins with a retrograde motion.

To which of the two main groups of planets does Earth belong?

What tool made possible the discovery of additional planets?

A common method for scientists to measure distances within the solar system is to use

What evidence suggests that Mars once had a warmer climate?

Which terrestrial planet has a day that is over two Earth months long?

Why is Venus sometimes called Earth's twin?

What is one factor that makes life possible on Earth?

What does the extra energy that Saturn gives off suggest about the planet?

Why is the planet Uranus considered a gas giant?

What is unusual about Pluto's moon Charon?

What evidence supports the current theory about our moon's origin?

What causes the phases of the moon?

What happens during a total solar eclipse?

Why do planets or moons with atmospheres have fewer impacts?

What is the main difference between an asteriod and a meteoroid?

Why are the inner planets called terrestrial planets?

What is the most useful unit for measuring distances within the solar system?

Why do active planets generally have fewer impacts than bodies like the moon?

What is one way that gas giants differ from the terrestrial planets?

What is the evidence that Mars once had liquid water?

Which of the following is evidence that Pluto is not a gas giant?

Which of these average distances is the astronomical unit based on?

How do gas giants differ from terrestrial planets?

Which number represents the orbit of Venus?

Beyond what numbered orbit are the comets of the Kuiper belt found?

_______________ are meteoroids that fall to Earth.

Most asteriods in our solar system are found between ___________________ and _____________________.

The counterclockwise spin of a planet or moon as seem from above the planet's North Pole is _________________.

Most asteriods in our solar system are found between _ and ___.

Most asteriods in our solar system are found between _ and ___.