Have you ever seen sand dunes on a beach? One of our favorite beaches has towering sand dunes, covered in beautiful green grasses. Dunes are amazing to see, and they are also an amazing ecosystem. What are dunes? Dunes are formed from sand and are commonly found on beaches and in deserts. They can even form underwater when strong currents move sand. In this nature study, we will be learning about dunes that form on the coasts near the ocean.