Topsoil is the upper, outermost layer of soil, usually the top 5–10 inches. It has the highest concentration of organic matter and microorganisms and is where most of the Earth’s biological soil activity occurs.
Fill dirt is earthy material used to fill in a depression or hole in the ground, or change the elevation or grade of a property in some way. Fill dirt is more recommended for building rather than planting.
Concrete sand is a label that is typically used to describe the coarse washed sand that is a common ingredient in cement and asphalt mixtures. Its grains are larger than those of masonry sand, but a processing and screening process ensures that there are no large rocks or pebbles present.
Clean fill products contain no small particles of ground rock, while minus fill does. These small particles help a product compact. For example, if you’re building a driveway over soft ground, a minus product can compact and stay in place.