B17. In which Eon did the oldest preserved continental crust form? _____________

Question

B17. In which Eon did the oldest preserved continental crust form? _____________________________________________________ (1 mark) B 18. What name is given to a series of volcanic rises parallel to convergent plate margins? ______________________________________________________ (1 mark) B19. What collective name s given to the crust and uppermost mantle? ____________________________________________________ (1 mark) B20. In a sedimentary rock what is significant about a preferred grain orientation and how does it form? (2 marks)

Explanation / Answer

b17 archean , because the oldest rock found belongs to that period

b18 volcanic arc

b19 lithosphere, the layer on which we live

b20 it occurs because of deformation and metamorphism this phenomenon is also called cleavage of sediment rocks. because of secondary folliation they get into prefered grain orientation moreover the type of cleavage is determined by this phenomenon

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