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The Natural Resources Conservation Service divides Iowa into 23 soil regions. In general, soils of southern, eastern, and western Iowa are loess-derived, while soils of northern and central Iowa are till-derived. Most level areas of Iowa have soils highly suitable for agriculture, making Iowa one of the most productive farming regions of the world.
Soil erosion may be a slow process that continues relatively unnoticed, or it may occur at an alarming rate causing a serious loss of topsoil. The loss of soil from farmland may be reflected in reduced crop production potential, lower surface water quality and damaged drainage networks. Soil erosion could also cause sinkholes.
Slope stability refers to the condition of inclined soil or rock slopes to withstand or undergo movement; the opposite condition is called slope instability or slope failure. The stability condition of slopes is a subject of study and research in soil mechanics , geotechnical engineering , and engineering geology .
A well-defined band of pahas runs between Mount Vernon and Martelle, Iowa and is crossed by Iowa Highway 1. Most are in Benton, Linn, Johnson and Jones counties. [citation needed] Casey's Paha State Preserve in Hickory Hills County Park, Tama County, Iowa preserves the southeast end of a 2-mile (3.2 km) long paha. [12]
Topography of Iowa, with counties and major streams Landforms of Iowa, based on Prior (1991) and Calvin (1904), with major rivers and streams. Despite popular perception, Iowa is generally not flat; most of the state consists of rolling hills. Prior [19] divides Iowa into eight landforms based on glaciation, soils, topography, and river drainage:
The Iowa Department of Natural Resources (Iowa DNR or IA DNR) is a department/agency of the U.S. state of Iowa formed in 1986, charged with maintaining state parks and forests, protecting the environment of Iowa, and managing energy, fish, wildlife, land resources, and water resources of Iowa.
In, "Geology of East-Central Iowa", R.R. Anderson (ed.), Iowa Geological Survey,42nd Annual Tri-State Geological Field Conference, Guidebook, pp. 2.2–2.94. Iannicelli, M. (2010). Evolution of the Driftless Area and contiguous regions of midwestern USA through Pleistocene periglacial processes.
Lake Keomah State Park is a state park in Mahaska County, Iowa, United States. To the park's immediate east is Keomah Village and the park is approximately 4 miles (6.4 km) east of Oskaloosa. Lake Keomah State Park is a 366-acre (148 ha) state park that surrounds and includes Lake Keomah. Lake Keomah is an 83-acre (34 ha) reservoir.