Water Pollution
Water pollution is when harmful things get into rivers, lakes, or oceans and make the water unsafe.
A glass of clean water sits on a counter. You drip a few drops of food coloring into it, and the color spreads through every part of the glass. The water is no longer clear or safe to drink. Even a small amount of dye changes the whole glass.
Explaining water pollution by grade level
When oil or trash gets into a lake, the water becomes dirty. Fish and plants in the water can get sick. People use soft pads to soak up the oil. Cleaning the water helps the fish and plants stay healthy.
Projects that explore water pollution
Water pollution means harmful things get into rivers or lakes and stay there. You stir food coloring into a jar of water. Even after adding seven cups of clear water, the color thins but never goes away. Pollutants in streams work the same way.
Waste products from living creatures can turn clean water unsafe. In this experiment, fish release carbon dioxide as they breathe, and that gas dissolves in the tank water. Over eight hours the water grows more acidic, showing how biological waste pollutes an aquatic environment. Tanks with more plants keep the pH stable, demonstrating one way nature counteracts water pollution.
Engine oil is difficult to remove once it enters water, but polypropylene pads can soak it up during spill cleanup. The question is whether adding detergent to the water changes how well those pads work. You mix engine oil and water in a container, then add one of four detergents — Tide, Wisk, Jet Dry, or Dawn. After the mixture settles, you place a polypropylene pad in it, then weigh the pad before and after to measure oil absorption. A control test with no detergent shows the baseline, and the results reveal whether detergent helps or blocks absorption.