A surface low is typically located where relative to a jet stream trough?.

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.

Intrusion is the best answer and the newest form.

Add the map and the options so i can further you, you so much. : )