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21. While digging, a person found that most of the rocks were igneous rock. What

can be concluded?
a. The rocks were probably carried there by ancient people.
b. The area was once covered by an ocean.
C. A glacier passed through at one time.
d. A volcano was nearby at one time.

User Ugesh Gali
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1 Answer

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The answer is ā€œDā€ A volcano was nearby at one time
User Jaswinder Singh
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