Answer:
<em>This question is based on Map T-4, a portion of the "Voltaire, North Dakota, quad- rangle (scale 1:24,000, contour interval 5 feet) and Figure 35-4</em>
When the rivers flow in the floodplains leaving strips of land parallel to and above the river, and also step like benches along a valley as remnants from previous higher elevations of the river due hydrological or climatic shifts, stream terraces are formed.
The Souris River is a North American river draining around 61 km2 from the canadian province of Saskatchewan through North Dakota in the USA and turning back to canada until the province of Manitoba; considering that section of the map, the stream terraces in the sw 1/4 of section 33 are aproximately 35 feet.
