We use the terms soil and dirt interchangeably, but they are not one and the same. Dirt is one component of soil, which is a complex mixture of several components.
Peat - Wikipedia
Sand? Clay? Loam? What Type of Soil Do You Have?
Dirt piles explained by Marblehead developers – Orange County Register
Conserving Earth
Restoring California Meadows Could Help Combat Climate Change And Increase Water Supply
Environments, Free Full-Text
Dirt – Minecraft Wiki
Dakota County Soil and Water Conservation District
Urban Soil vs. Forest Soil - Ryno Lawn Care, LLC
Off-road drivers still battling conservationists on Pinelands access - WHYY