Hi:) in oceanic oceanic plate convergence , the denser pacific plate subduct under the less dense Philippine oceanic plate. Just curious to find out why is the pacific plate denser than the Philippine plate... anyone able to explain ? Thanks!

Answer (d) may increase or decrease porosity through dissolution or deposition;

Tropical climate is experienced in the nothern countries of south america

When a lake, river or other aquatic  system  becomes  eutrophic, it can have serious negative effects on other organisms like fish, birds and even people.if an algal bloom is so bad that it causes wide-spread death  in  the  water, the organisms that die will all sink to the bottom and start to decompose.