PowerPoint with Audio: Composting Creates Soil. Part 1 of 4 soil presentation in the Living on Planet Earth Series. This program describes how soil is made. By recycling plant materials we help produce vibrant soils that offer nurturing food, and dependable clothing fiber and building materials.
"We know that, on average, each tree absorbs from 13 to 48 pounds of carbon dioxide per year. We have planted 15 trees. How much carbon dioxide absorption will the trees we’ve already planted enable in the next 50 years?" Five math problems with an environmental theme.