in the Great Lakes
Have you ever climbed a sand dune? There are a lot of them in West Michigan. The sand on the beaches here is made up of quartz, feldspar and magnetite. It comes from bedrock that was crushed and left behind by glaciers years ago.
The dunes themselves are formed by winds that blow the sand on the beaches into dunes. Sand dunes shift and change over time as winds continue to blow the sand.
Click here to see the Kirk Park website.