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ESS 101 Midterm Exam questions and answers Graded A+ latest update As igneous rock partially melts the magma is typically __________. a. more mafic (Fe-rich) than the rock b. more felsic (silica-rich) than the rock c. lower density than the rock d.
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ESS 101 Midterm Exam questions and answers Graded A+ latest update As igneous rock partially melts the magma is typically __________. a. more mafic (Fe-rich) than the rock b. more felsic (silica-rich) than the rock c. lower density than the rock d. answers a and c are both correct e. answers b and c are both correct - e The silicate mineral amphibole has 50% of its silicate tetrahedra possessing 3- shared oxygen atoms and 1-unshared and 50% of its silicate tetrahedra possessing 2-shared oxygen atoms and 2-unshared oxygen atoms. What is the ratio of Si:O in the tetrahedral structure of this mineral
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