Oil slicks are thin layers of oil that float on the surface of water, often resulting from spills or leaks. These slicks can be harmful to marine life, as they block sunlight and can poison aquatic organisms. The presence of oil slicks can disrupt ecosystems and lead to long-term environmental damage. When oil spills occur, they can spread quickly, affecting vast areas of ocean and coastlines. Cleanup efforts are challenging and can take years to restore affected habitats. Organizations like NOAA and EPA work to monitor and mitigate the impacts of oil slicks on the environment.