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.