Discussion
Consider the following statements about rocks.
1. Granite and rhyolite differ in grain size but not composition 2. A dyke is concordant with the bedding 3. Bedding is the characteristic feature of sedimentary rocks
Answer: D
Correct answer: 1 and 3 only are correct
Statements 1 and 3 are correct: granite and rhyolite differ only in grain size, and bedding is the characteristic feature of sedimentary rock. Statement 2 reverses the definitions - a dyke is discordant, cutting across the bedding, while a sill is concordant and follows it. The distinction matters in the field, since it tells you at once how the body was emplaced.
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