Sara used a plastic ruler to scratch a wooden desk. She noticed a scratch mark on the desk but none on the ruler. This shows that the ruler is __________ than the desk.
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Worked Solution
Step 1: In a scratch test, the harder material scratches the softer one.
Step 2: Since the ruler scratched the desk and remained unmarked, the ruler is harder.
Step 3: Final Answer: harder.
Correct answer: harder
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