Hey Ray: Sand dunes 02:22. PITTSBURGH (KDKA) - A windy day on the beach can leave you a sandy mess with sand everywhere from in your clothes to sand in your hair.

Dunes are sandy elevated landforms that typically have plants growing in them. They are often found along low-lying coastlines where strong waves and currents drive sand onshore to the beach.

The desert’s enormous star dunes are mysterious structures. These sand dunes are found in some of Earth’s largest modern deserts, but also on the planet Mars and Saturn’s largest moon, Titan.