#9: the way the humans impact the water in the picture is, you can see that there is waste being dumped into the oceans which is causing water pollution that can affect billions of animal life and human life since they are pretty much dumping waste water into drinking water. In the picture you can see that it deals with a lot of oils which in may cases has a lot of chemicals in it and that can be caused by humans if they don't dispose the oils properly
#10: The one point source in the picture is the chemical pollution, like i said in #9, it could cause water pollution. The non-point source in the picture is the biological pollution, sometimes when it rains it creates a lot of runoffs aka flooding which can carry unwanted bacteria to oceans and cause eutrophication which you can see in the picture the green algae stuff.
Hope this helped :)
Have a great day