Soil can be brown, black, crumbly, dry, wet--but so can dirt. So what's the difference? People often use the words "soil" and "dirt" to mean the same thing, but in science they are not the same at all. Soil is a material that plants can grow in, while dirt is the muddy footprints you leave on the floor on a wet day. Inside this book, readers will get down and dirty as they investigate what makes soil special and why dirt is something we need to wipe,...