Activity 3.3.3 – My Plastic Use . By. Benny Sanchez Microplastics: The Silent Threat to Our Planet Plastic pollution has become one of the most pressing environmental issues of our time. While we are all familiar with large plastic items like bottles and bags, there is a hidden menace lurking in our oceans, rivers, and even in the air we breathe!.. microplastics. In this blog post essay, the definition of microplastics, where they are found, how they get there, and why they are problematic to humans and the environment will be covered. Definition and Types of Microplastics: Microplastics are tiny pieces of plastic that are less than 5 millimeters in size. They can be categorized into two main types: primary microplastics and secondary microplastics. Primary microplastics are intentionally manufactured at small sizes for specific purposes, such as the microbeads found in personal care products like face scrubs and toothpaste. On the other hand, secondary microplastics are formed a...