The Great Pacific Garbage Patch is primarily made up of which type of garbage?

The Great Pacific Garbage Patch is mostly of tiny bits of plastic. These small pieces are called microplastics. They cannot always be seen. Often, they just make the water look like a cloudy soup.

iii. and iv. only is the right answer

ń, wǒ shuō yīngyǔ, dàn wǒ huì shuō qítā yǔyán, rú xībānyá yǔ fǎyǔ yìdàlì yǔ hé pǔtōnghuà, suǒyǐ bùyào pànduàn, dànshì