8. Most erosion in a narrow V-shaped valley •is directed from side to side.
• is directed downwards.
• occurs on the floodplain.
•occurs on the stream's banks.

There is totally sun all the way down there.

Answerkolkata;

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.