Use the accompanying figure of the Mohs scale of hardness to answer this question. If you have a mineral sample that is capable of scratching a penny but is scratched by a wire nail, its hardness must be ________
A) less than 3.5
B) between 3.5 and 4.5
C) greater than 4.5
D) less than 2.5
Answer: B
Environmental & Atmospheric Sciences
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What will be an ideal response?
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The Morrison Formation contains one of the richest assemblages of mammal fossils
a. True b. False
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