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Lemon juice turns litmus paper red, is corrosive and tastes sour. Lemon juice is classified as

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Question I was asked: On a field trip, a student holds a frog and reports that it has slippery skin. This is an example of

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Which of these actions will change a sedimentary rock, such as limestone, into a metamorphic rock, such as marble?

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Question generated: An apple appears red when struck by white light. This appearance is because the red light is reflected and the other colors are absorbed. What color will this apple appear to be when struck by blue light?

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

Answer: Changes to Earth's surface can happen slowly or quickly. Which of these changes happens the most quickly?

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

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Hydrogen gas and oxygen gas combine to form water. Which would be a more concise way of expressing what happens in this chemical reaction?