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A: Spills usually happen due to bad weather (hurricanes, storms, and earthquakes), intentional acts of violence (like war, vandals, or dumping) and human mistakes. The main sources of the spilled oil are usually: 1. Tankers (boats that carry oil from one location to another) crashing, breaking, or running up on land. 2.
The rate at which an oil spill spreads will determine its effect on the environment. Most oils tend to spread horizontally into a smooth and slippery surface, called a slick, on top of the water. Factors which affect the ability of an oil spill to spread include surface tension, specific gravity, and viscosity.  Surface tension is the measure of attraction between the surface molecules of a liquid.