Some of the most problematic MSW in oceans are A) heavy metals ...

[serike]

Some of the most problematic MSW in oceans are
 
  A) heavy metals and other toxic elements from coal ash.
  B) wood, vegetation and paper originating from landfills and commercial shipping.
  C) food wastes dumped by large tourist liners.
  D) non-biodegradable plastics that contain toxic materials and circulate in huge gyres.

Question 2

Over a period of time, a slowly crystallizing magma liquid develops a higher silica content while magnesium abundance decreases through fractional crystallization.
 
  Do the minerals crystallizing from the magma contain more silica relative to the starting magma or do they contain more magnesium relative to the starting magma?
   a) The minerals contain more Si than the magma liquid
   b) The minerals contain more Mg than the magma liquid

[k.lashomb]

Answer to Question 1

D

Answer to Question 2

B

[serike]

TYSM

[blakcmamba]

Gracias!