1.) explain the theories of continental drift, seafloor spreading, and plate tectonics.
2.) describe three types of plate boundaries and identify the land formations that result from these movements.

C.about 10% i think

Answer light in color; silica-rich;

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.

D. i believe that doesn't even exist.