Discussion
Assertion (A): A geological map uses unrelated hues rather than a graded sequence of tones.
Reason (R): Rock types differ in kind rather than in degree, so no ordering is implied.
Answer: D
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason is the principle. Rock types are a nominal category: sandstone is not more or less of anything than granite, so a sequence of tones running light to dark would imply an order that does not exist. Unrelated hues signal difference in kind. A graded sequence is reserved for data that genuinely are ordered, and that is the basic rule linking data type to visual variable.
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