30. 30. Which of these statements about the diagram of a divergent plate boundar

Question

30.

30. Which of these statements about the diagram of a divergent plate boundary is correct? a. There is melting at A because of increased temperature b. There is melting at A because of decreased pressure c. There is melting at B because of increased temperature d. There is melting at B because of decreased pressure 31. Which statement regarding mechanical weathering is NOT true? a. Allows for faster rates of chemical weathering b. Is important in the formation of sand c. Breaks rocks into smaller pieces d. Causes a major change in mineral composition 32. What factor(s) would make an igneous rock more easily chemically weathered? a. Compaction and cementation rather than erosion and transportation b. Mafic composition rather than a felsic composition c. Mechanical weathering has occurred d. a and b e. b and c

Explanation / Answer

30) (B) The more noticeable the temperature of the rising mantle and the more unmistakable the weight drop, the more melted material is conveyed. The made magmas by this are basalts.

31) (D) In chemical weathering there is a chemical change, so the composition of newly formed minerals is entirely different from those of the parent rock or material as in this type of weathering the processes like oxidation, hydrolysis, reaction with acids etc took place.

32) (E) Mafic minerals get more easily weathered in comparision to felsic minerals as silica is present in large amount in felsic rocks and its resistive to mechanical weathering. If machenical weathering has occured in the igneous rocks thenthe cracks for e.g developed in them will lead to more chemical weathering in that area as ther will be more reactions taking place due to the exposure.

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