Episode 30 - Season Finale - Ocean Pollution (Oceans Part - 3)

In episode 30, we are talking about ocean pollution. 

What are the 3 primary sources of ocean pollution? 
Where is the Great Pacific Garbage Patch, and how big is it? 
What is a dead zone?
What is microplastic, and why is it harmful? 
What can we do to keep our oceans clean?

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