Water pollution is one of the world's worst forms of pollution. For example, take a look at a glass of water. It may appear clear, but there are really millions of microscopic pollutants floating in it. Approximately 70% of the earth's surface are covered by water; water is a very dynamic system, any change in its normal content could affect local, regional, and eventually worldwide water.Oil is one of the world's biggest pollutants; oil is usually spilled or leaked from land or rivers and flows from them to the sea or ocean. The more direct form of oil pollution is when ships transporting oil leaks or the ship crashes. Oil can also ruin shores it can was up on them and become tar like lumps; some coat fur of animals and can effect their heating system. Also some oil can find its way into other sources causing hazardous water to be consumed. In some extreme cases, rivers, lakes, and wells have been known to ignite.