Caption: Workers using high-pressure, hot-water washing to clean an oiled shoreline after the Exxon Valdez oil spill in 1989.
Part of "America the Beautiful" is about a "shining sea." What do you think of when you hear those words? A clean, fresh ocean? It is too bad that the ocean is not that clean. Ocean pollution is a big problem.
The ocean covers around 70% of the Earth's surface. The ocean has different layers in it like a big blue layer cake. These layers are called zones. The top zone has a happy name. It is the sunshine zone. It goes down about 600 feet.