Body Paragraph #1
Heading: Causes of Ocean Pollution
A. First major point (topic sentence): Ocean pollution is mostly caused by human activities that dump waste into our waterways.
Supporting detail idea 1: One major contributor is plastic waste; millions of tons of plastic enter the ocean every year from landfills and streets, where it eventually washes into rivers and seas.
Supporting detail idea 2: Another significant source is industrial runoff, which includes chemicals and heavy metals that factories discharge into nearby rivers and oceans without proper treatment.
Supporting detail idea 3: Additionally, oil spills from ships and drilling rigs can severely contaminate ocean water, harming marine life and damaging ecosystems for years.
Transition to next paragraph: Now that we understand what causes ocean pollution, let’s look at the impact it has on both marine life and humans.