The Big Spill
 Have you ever made salad dressing and discovered that oil and water don't mix? Oil is lighter than water and will float to the top. When oil is spilled in the ocean, it floats. The oil spreads quickly and creates an oil slick. As the oil becomes thinner it forms an oil sheen. Maybe you've noticed rainbows or silvery spots on the asphalt on hot summer days. Those oil sheens are caused by oil spills. During the first 24 - 48 hours, thirty to forty percent of the spilled oil will change into vapor. Move the mouse over the oil spill to see how this works.
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