11. Which of the following is correct? n s radiation a. Slow cooling forms small crystals. b. Metamorphic rocks solidify to form igneous rocks. c. Compacting and sedimentation turn igneous rocks into metamorphic rocks. d. Magma that crystallizes at the surface is called volcanic rock or extrusive igneous rock. 12. The softest mineral is a. calcite b. diamond c. fluorite d. talc 13. Which feature commonly describes an igneous rock? a. foliated c. contains fossil d. has no fossil and foliation b. layered 14. Which property of mineral shows resistance to be broken? a. Cleavage b. Luster c. Specific Gravity d. Transparency 15. If a rock can be scratched by a finger nail, its hardness is а. 1-2 b. 2-4 с. 4-6 d. 8-10

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