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On the periodic table, the elements in group 18 (8A) (helium, neon, argon, etc.) are grouped together because

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Question generated: Which is the best example of recycling?

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

Answer: A short plant with a thick, fleshy stem, extensive roots, and a short blooming period would most likely be found in which of the following environments?

question: Write a question you would see in a school textbook. OPTIONS:
- balanced forces.
- unbalanced forces.
- equal and opposite reactions.
- objects in motion.
answer: In a lab investigation, a student notes that two metal blocks have the same mass. Based on this observation, if the two blocks were put on opposite sides of a balance, they would best represent

An example of a grad-school level question?
Which of these geographic features most directly influences the climate of Nevada by limiting the amount of water vapor that can reach the state and fall as rain?

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At night, the Moon is the brightest object in the sky. Where does the Moon's light come from?