What Happens to Plastic in the Ocean?

Seriously what do people think will happen to plastic thrown into the ocean, lakes, rivers or even any large body of water?
Most plastics DON'T biodegrade unless they were specially made. So the plastics that float will eventually accumulate in a mass and those that don't stay buoyant will become dangerous for those creatures living in the ocean lakes rivers etc... how many animals such as turtles are found with plastic 6 pack rings harmfully wrapped around their fins/arms/legs. Sometimes people find those turtles and help them by removing it slowly.. it's extremely painful for the turtles. If not removed by people it can cut off all circulation in their fins and cause it to die then becoming a extremely dangerous health concern with the risk of death for the turtles.. It also happens to other marine life with different types of plastics that don't completely sink and stays slightly buoyant in the water..

We as a species need to DO BETTER !!