
Why we explore Mars—and what decades of missions have revealed
Quiz
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Others
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6th - 8th Grade
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Medium
Venus undefined
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9 questions
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1.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
What gas is mainly found in Mars' atmosphere?
Oxygen
Carbon Dioxide
Hydrogen
Nitrogen
Answer explanation
LIne 9: Unfortunately, the planet is now wrapped in a thin carbon dioxide atmosphere and cannot support earthly life-forms.
2.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
How long is a year on Mars?
365 days
687 days
700 days
1300 days
Answer explanation
LIne 5: That’s why one year on Mars lasts for 687 Earth days, while a day on Mars is just 40 minutes longer than on Earth.
3.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
What features on Mars indicate that there was once water?
Mountains
Rivers and valleys
Desert
Forests
Answer explanation
LIne 17: they see features that are unquestionably the work of ancient, flowing liquids: branching streams, river valleys, basins, and deltas.
4.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Why can't Mars support Earth-like life today?
It is too cold
It has too much water
It has a thin atmosphere
It is too big
Answer explanation
Line 9: Unfortunately, the planet is now wrapped in a thin carbon dioxide atmosphere and cannot support earthly life-forms.
5.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Mars is smaller than Earth.
True
False
Answer explanation
Line 3: It is just a smidge more than half of Earth’s size.
6.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Mars is the ____ rock from the sun, just after earth.
Fifth
Fourth
Second
Third
Answer explanation
Line 3: Mars is the fourth rock from the sun, just after Earth.
7.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
How does Mars’ gravity compare to Earth’s?
It is stronger than Earth’s gravity.
It is weaker, at 38% of Earth’s gravity.
It is the same as Earth’s.
It varies widely across the planet.
Answer explanation
Line 4: with gravity only 38 percent that of Earth’s.
8.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Why is water not accessible on Mars?
It evaporates too quickly.
It is too deep underground.
It is locked in polar ice caps and beneath the surface.
There is no water present at all.
Answer explanation
Line 11: Although water does exist on Mars, it’s locked into the planet’s icy polar caps and buried, perhaps in abundance, beneath the Martian surface.
9.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
The planet’s land area is roughly equal to the Earth’s continents.
True
False
Answer explanation
Line 7: Despite its smaller size, the planet’s land area is also roughly equivalent to the surface area of Earth’s continents.
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