Question
General Geology
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17. What kind of melting is found at point 'A'? an Decompression melting b, Heat transfer melting c, Flux melting d. Ice melting 18. What kind of rocks are commonly erupted from the volcanoes above point A a. Granite b. C&D; c, Basalt d, Andesite 19. Which mountain range is a modern day example of the tectonic setting seen above point 'A'? a. The Andes b, The Rockies c, The Cascades d. A & C 20. By which processes may magma compositions become more silicic? a. Decompression melting b. Assimilation c. Addition of volatiles d. All of the above 21. Which rock types indicate a tropical environment in the past? a Sandstones and rock salt b. Coal and limestones d. None of the above
Explanation / Answer
17) flux melting. flux melting is the melting which is favoured by the addition of water molecules and volatiles
18) c and d
19) andes and cascades
20) all of the above
21) coal and limestone