plastic in the ocean

Why is there a island of plastic in the middle of the ocean? Because bigger cities along the coast they tend to throw more trash in the ocean. Even islands that are small seem to get a lot of trash on their shore. People throwing trash from California floats all the way to Hawaii and arrives on the nice white sandy beaches. Did you know that there's a large island of trash that floats in currents  the size of Texas? I think GOAK should do somthing about this island of  floating trash.