[Q]: A student uses the following characteristics to describe a group of objects in space. * 200 billion stars * 30 million light years from Earth * 500 light years in diameter Which of the following is the student most likely describing?
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OPTIONS:
- a galaxy
- the universe
- a constellation
- the solar system
****
[A]: a galaxy

[Q]: When bedrock in Massachusetts is examined, it often appears scraped and polished. Which of the following most likely caused the bedrock to appear scraped and polished?
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OPTIONS:
- crustal deformation
- frequent earthquakes
- glacial movement
- volcanic eruptions
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[A]: glacial movement

[Q]: The burning of fossil fuels has increased the carbon dioxide content of the atmosphere. What is a possible effect that the increased amount of carbon dioxide is likely to have on our planet?
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OPTIONS:
- A warmer climate
- A cooler climate
- Lower relative humidity
- More ozone in the atmosphere
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[A]:
A warmer climate