Chapter 21 Test
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Last updated about 5 years ago
50 questions
2
To which of the two main groups of planets does Earth belong?
To which of the two main groups of planets does Earth belong?
2
What tool made possible the discovery of additional planets?
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
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?
What evidence suggests that Mars once had a warmer climate?
2
Which terrestrial planet has a day that is over two Earth months long?
Which terrestrial planet has a day that is over two Earth months long?
2
Why is Venus sometimes called Earth's twin?
Why is Venus sometimes called Earth's twin?
2
What is one factor that makes life possible on Earth?
What is one factor that makes life possible on Earth?
2
What does the extra energy that Saturn gives off suggest about the planet?
What does the extra energy that Saturn gives off suggest about the planet?
2
Why is the planet Uranus considered a gas giant?
Why is the planet Uranus considered a gas giant?
2
What is unusual about Pluto's moon Charon?
What is unusual about Pluto's moon Charon?
2
What evidence supports the current theory about our moon's origin?
What evidence supports the current theory about our moon's origin?
2
What causes the phases of the moon?
What causes the phases of the moon?
2
What happens during a total solar eclipse?
What happens during a total solar eclipse?
2
Why do planets or moons with atmospheres have fewer impacts?
Why do planets or moons with atmospheres have fewer impacts?
2
What is the main difference between an asteriod and a meteoroid?
What is the main difference between an asteriod and a meteoroid?
2
Why are the inner planets called terrestrial planets?
Why are the inner planets called terrestrial planets?
2
What is the most useful unit for measuring distances within the solar system?
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?
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?
What is one way that gas giants differ from the terrestrial planets?
2
What is the evidence that Mars once had liquid water?
What is the evidence that Mars once had liquid water?
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Which of the following is evidence that Pluto is not a gas giant?
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?
Which of these average distances is the astronomical unit based on?
2
How do gas giants differ from terrestrial planets?
How do gas giants differ from terrestrial planets?
2
Which number represents the orbit of Venus?
Which number represents the orbit of Venus?
2
Beyond what numbered orbit are the comets of the Kuiper belt found?
Beyond what numbered orbit are the comets of the Kuiper belt found?
2
_______________ are meteoroids that fall to Earth.
_______________ are meteoroids that fall to Earth.
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Most asteriods in our solar system are found between ___________________ and _____________________.
Most asteriods in our solar system are found between ___________________ and _____________________.
2
The counterclockwise spin of a planet or moon as seem from above the planet's North Pole is _________________.
The counterclockwise spin of a planet or moon as seem from above the planet's North Pole is _________________.
2
Unlike most planets, Venus has a(n) __________________ rotation, which means that it appears to spin in a clockwise direction.
Unlike most planets, Venus has a(n) __________________ rotation, which means that it appears to spin in a clockwise direction.
2
A meteoroid is called a(n) ___________________ only after it has struck Earth's surface.
A meteoroid is called a(n) ___________________ only after it has struck Earth's surface.
2
The inner planets of our solar system are called ________________________.
The inner planets of our solar system are called ________________________.
2
Some scientists refer to _______________ as "dirty snowballs" because they are composed of ice, rock and cosmic dust.
Some scientists refer to _______________ as "dirty snowballs" because they are composed of ice, rock and cosmic dust.
2
When the Earth's shadow falls on the moon, a ________________ occurs.
When the Earth's shadow falls on the moon, a ________________ occurs.
2
The amount of time an object takes to orbit around another body once is its ____________________.
The amount of time an object takes to orbit around another body once is its ____________________.
2
The amount of time an object takes to rotate once is its _____________________.
The amount of time an object takes to rotate once is its _____________________.
2
The different appearences of the moon are called __________________.
The different appearences of the moon are called __________________.
2
When the moon's shadow falls on part of the Earth, a ____________________ occurs.
When the moon's shadow falls on part of the Earth, a ____________________ occurs.
2
Frozen bodies made of ice, rock and dust are called _____________________.
Frozen bodies made of ice, rock and dust are called _____________________.
2
Small, rocky bodies that revolve around the sun are called _____________________.
Small, rocky bodies that revolve around the sun are called _____________________.
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Bright streaks of light that result when rocky bodies burn up are called ____________________.
Bright streaks of light that result when rocky bodies burn up are called ____________________.
2
Contains the five planets farthest from the sun.
Contains the five planets farthest from the sun.
2
A group of very large planets that are composed mainly of gases.
A group of very large planets that are composed mainly of gases.
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Contains the four planets that are located closest to the sun.
Contains the four planets that are located closest to the sun.
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A unit of measurement based on the average distance between Earth and the sun.
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.
A group of planets whose surfaces are hard and rocky.
2
This planet is known for its spectacular ring system.
This planet is known for its spectacular ring system.
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This planet's year is only 88 Earth days long.
This planet's year is only 88 Earth days long.
2
This planet had a storm system called the Great Dark Spot.
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.
This is the only planet known to contain life as we know it.
2
This inner planet spins with a retrograde motion.
This inner planet spins with a retrograde motion.