Sure, soil is an ecosystem, but topsoil is the top part of that soil. The surface layer. If you bulldoze a rainforest, there's no more rainforest. But if you sc

Sure, soil is an ecosystem, but topsoil is the top part of that soil. The surface layer. If you bulldoze a rainforest, there's no more rainforest. But if you scrape away topsoil, you have subsoil, and you have a big pile of topsoil.