Soil Getting the Dirt on Soil Land in Southern Ontario is mainly used for farming and mining. What is soil? Dirt that gets on your clothes. Any area that is not covered by water. A layer of organic matter and weathered rock that supports plants. Waste and organic matter from ecosystems. None of the above. What are the three components of soil? What types of soil are best for farming? Wetland and grassland Forest and tundra Grassland and desert Forest and grassland None of the above What type of soil has the least topsoil (A horizon)? Desert Forest Grassland Wetland None of the above What are the organisms that break down dead matter in soils? Give an example of a detritivore in soil. Slugs, millipedes, nematodes, ants, fungi, beetles, and worms Animal burrows are bad for soil. What is a process that carries away soil? precipitation sediment weathering erosion decomposing What three factors determine where populations of people can live? Where is the largest area of farmland in Canada? What is found in the A horizon (topsoil)? Only dissolved minerals Mainly weathered rock and dissolved mineral Some organic matter and dissolved minerals Mainly organic matter Bedrock, some weathered rock and minerals