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A fingernail has a hardness of about:

A5.5
B1.0
C7.5
D2.5
Answer & Solution
Correct answer: D. 2.5
1. Glass or a knife blade is 5.5. 2. A fingernail is 2.5. 3. It can scratch talc and gypsum. _Source: syllabus Fundamentals of Physical Geography, Chapter 5, Minerals and Rocks._
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