water pollution

1. When contamination originates from a single source
6. When rain falls and seeps deep into the earth, filling the cracks, crevices, and porous spaces of an aquifer
7. eighty percent of ocean pollution (also called marine pollution) originates on land—whether along the coast or far inland

2. Covering about 70 percent of the earth, __________ is what fills our oceans, lakes, rivers, and all those other blue bits on the world map.
3. is contamination derived from diffuse sources
4. Big spills may dominate headlines, but consumers account for the vast majority of oil pollution in our seas, including oil and gasoline that drips from millions of cars and trucks every day
5. It goes without saying that water pollution can’t be contained by a line on a map