Pollution is the introduction of harmful materials into the environment. These harmful materials are called pollutants. Pollutants can be natural, such as volcanic ash. They can also be created by human activity, such as trash or run off produced by factories. Pollutants damage the quality of air, water and land.
People should learn about the currents, waves, and tides just in case of an emergency or the tides are too high. The people should know if their worried about their structure of their home, or worried about their safety.
