【地球科学问题1.Manyrocksproducedbycontactmetamorphismshowlittleornofoliationbecause:(a)verylittledeformationaccompaniesthemetamorphism.(b)thistypeofmetamorphismoccursatveryhighpressures(c)thistypeofmetamorphismoccu】

　　地球科学问题

　　1.Manyrocksproducedbycontactmetamorphismshowlittleornofoliationbecause:

　　(a)verylittledeformationaccompaniesthemetamorphism.

　　(b)thistypeofmetamorphismoccursatveryhighpressures

　　(c)thistypeofmetamorphismoccursatverylowpressures

　　(d)noneoftheoriginalmineralsrecrystallizedduringthemetamorphism.

　　2.Regionalmetamorphismoccurswhen:

　　(a)sedimentsareburiedtogreatdepths.

　　(b)magmamovesupthroughtheearth’scrust,towardthesurface.

　　(c)brittlerocksareintenselydeformedatveryhighpressures.

　　(d)sedimentsaremeltedatveryhightemperatures.