science kids microplastics and my health what i need to know V1-0002 Microplastics are tiny particles of plastic that come from a variety of sources such as beauty products, synthetic textiles, and plastic waste. These particles are so small that they can easily enter our water sources and oceans, posing a threat to marine life and ecosystems. With over 300 million tons of plastic generated annually, the accumulation of microplastics is a growing concern that requires immediate attention and action to reduce their impact on the environment.