An oil slick is a thin layer of oil that floats on the surface of water, often resulting from spills or leaks. These slicks can occur in oceans, rivers, and lakes, and they can be harmful to marine life and ecosystems. The oil can spread quickly, creating a shiny, dark film that can be seen from above. Oil slicks can originate from various sources, including oil tankers, offshore drilling, and industrial discharges. When oil enters the water, it can affect the health of aquatic organisms, disrupt food chains, and damage habitats like coral reefs and mangroves. Cleanup efforts are often challenging and costly.