What’s on your mind this Earth Day, Bleeding Heartland readers? This is an open thread: all topics welcome.

Today I had the pleasure of watching my friend and personal hero, 1000 Friends of Iowa co-founder LaVon Griffieon, educate groups of elementary school students about soil conservation. She carved up an apple to illustrate how little of the earth’s surface is arable land, and by extension why we need to preserve our farmland. Several versions of this “apple earth” demo are available on YouTube. I’ve posted a couple of examples after the jump.

Speaking of our priceless Iowa farmground, Iowa State University is collecting data on soil erosion here. The researchers are interested in photographs of farm fields that have “experienced substantial soil movement or loss” due to spring rainstorms. You can submit photos to the Iowa Daily Erosion Project in the ISU Department of Agronomy.

Here’s a short version of the “Apple as Planet Earth,” courtesy of the American Farmland Trust.

Here’s an educator carving a real apple, in the style of LaVon’s presentation today.