B11. What is meant by the term ?sediment sorting\'? (1 mark) B12. What type of p
ID: 157580 • Letter: B
Question
B11. What is meant by the term ?sediment sorting'? (1 mark) B12. What type of plate boundary is associated with continental rifts? (1 mark) B13. What grade of metamorphism does the mineral sillimanite indicate? (1 mark) B14. What crystal system is represented in the image below? (1 mark) B15. What sedimentary environment can be interpreted from the following description: well sorted, well rounded, fine-medium sand and 100% quartz? B16. What are the three main types of seismic wave generated by an earthquake?Explanation / Answer
B11:- sorting means distribution according to the grain size, either in sedimentary rocks or in unconsolidated deposits
b12:-divergent boundaries because in ths case the plates are moving away from each other which causes continental rifts
b13:- low grade because these crystals are lustours which shows presence of water in it so it is a low grade metamorphosis
b14:- tetragonal, because Two axes are of equal length and are in the same plane,
b15:- this shows that the perfect grinding has been taken place and the quartz crystals are now far from the source rock because the crystals are fine. this comes under classical sedimentation
b16:- primary wave, secondary wave and surface waves
primary waves are compressional wave , s waves are shear waves and surface wave are the final waves that reaches till the surface of the crust
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