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15
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How do baby turtles know their way to the sea?
Starlight and moonlight shining on the water pull them toward the sea.
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How many stars could people see one hundred years ago?
They could see about 1,500 stars.
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What problem does carbon dioxide cause?
Carbon dioxide traps heat near the Earth's surface, causing global warming.
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What do female sea turtles come ashore to do?
They lay eggs in the sand.
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In 1954, why did about 50,000 birds die?
They flew straight into the ground because of the spotlights at a US Air Force.
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baam
Lose 15 points!
Oops!
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star
Double points!
Okay!
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rocket
Go to first place!
Okay!
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thief
Give points!
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25
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heart
Other team wins 20 points!
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star
Double points!
Okay!
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rocket
Go to first place!
Okay!
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banana
Go to last place!
Oops!
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eraser
Reset score!
Oops!
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star
Double points!
Okay!
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gift
Win 25 points!
Okay!
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thief
Give points!
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25
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When did astronomers start to know about light pollution?
They began to realize it in the 1970s.
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15
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What word from the text means 'things people do'?
human activity
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What causes light pollution?
It is caused by excess light that is beamed into the sky.
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Why did stars 'disappear'?
City lights made them impossible to see.
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What word means 'active at night'?
nocturnal
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If turtles go into streets and parking lots, what will happen to them?
Cars can run over them.
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Why does excess light create light pollution?
It reflects onto low clouds, causing a sky glow that blots out the stars.
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15
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What makes birds fly in the wrong direction?
Lights from buildings make them veer off course.
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