9 multiple choice 5 points the amount of magnesium and iron ______. decreases in darker - colored rocks…

9 multiple choice 5 points the amount of magnesium and iron ______. decreases in darker - colored rocks increases in lighter - colored rocks increases in rocks that are high in silicon increases in mafic rocks 10 multiple answer 5 points which two of these would be demonstrated in the himalayan mountains? contact metamorphism regional metamorphism schistose metamorphism subterranean metamorphism hydrothermal metamorphism gneissic metamorphism metamorphism at convergent plate boundaries

9 multiple choice 5 points the amount of magnesium and iron ______. decreases in darker - colored rocks increases in lighter - colored rocks increases in rocks that are high in silicon increases in mafic rocks 10 multiple answer 5 points which two of these would be demonstrated in the himalayan mountains? contact metamorphism regional metamorphism schistose metamorphism subterranean metamorphism hydrothermal metamorphism gneissic metamorphism metamorphism at convergent plate boundaries

Answer

Brief Explanations:

For question 9: Mafic rocks are rich in magnesium and iron. Dark - colored rocks are often mafic and have higher amounts of these elements. Lighter - colored rocks are usually felsic with less magnesium and iron. Rocks high in silicon are felsic and have lower magnesium and iron content. For question 10: The Himalayan Mountains are formed at convergent plate boundaries and are an example of regional metamorphism due to large - scale tectonic forces.

Answer:

  1. D. increases in mafic rocks
  2. B. regional metamorphism, G. metamorphism at convergent plate boundaries