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Astronomers have found evidence for the existence of a super-massive black hole in the center of the giant elliptical galaxy M87. What is thought to cause black holes to form?

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Question generated: Many birds fly south for the winter. This adaptation is called

Problem: Write a question you would see in a school textbook.

Answer: If a classroom experiment involves the use of several unidentified chemical solutions, which factor would be most important in maintaining safety during the experiment?

question: Write a question you would see in a school textbook. OPTIONS:
- increased precipitation
- the weathering of rocks
- a decrease in wind speed
- a change in air temperature
answer: Which of the following is most likely to cause water to change from one state of matter to another state of matter?

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From Earth, the Sun appears brighter than any other star because the Sun is the

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The surface of Earth is covered by a relatively thin layer of water called the