Study the FIGURE 7.3 below and answer the questions that follow. 7.3.1 What is a drainage pattern? 7.3.2 Identify drainage patterns A and C. 7.3.3 Compare the underlying rock structures of drainage patterns B and C. 7.3.4 Account for the direction of the stream flow in patter A. 7.3.5 Explain why drainage pattern B is suitable for farming? 7.3.6 Draw a simple, labelled plan view sketch of a drainage pattern that will develop in a folded landscape.

Question 1

Answer · 2026-03-16T02:56:46.794Z

7.3.1 A drainage pattern is the geometric configuration or spatial arrangement of a stream network and its tributaries in a drainage basin, controlled by factors such as geology, topography, rock resistance, and slope. 7.3.2 Drainage pattern A: Dendritic. Drainage pattern C: Parallel. 7.3.3 Drainage pattern A (dendritic) develops on uniform, horizontally bedded rocks with homogeneous resistance, allowing streams to form a branching, tree-like network without structural control. Drainage pattern B (trellis) develops on folded or tilted strata with alternating resistant and less resistant layers, where main streams follow weak layers in synclines and tributaries cut perpendicularly across resistant anticlines. 7.3.4 The streams in pattern C flow in a consistent direction due to a uniform topographic gradient or uniformly dipping bedrock strata, causing parallel stream channels to develop downslope on a consistent regional slope. 7.3.5 A trellis drainage pattern develops in a folded landscape. Simple labelled plan view sketch (description for drawing): Parallel elongated valleys (synclines) with long main streams flowing along them. Shorter tributaries join perpendicularly from adjacent ridges (anticlines). Label: `Main streams in synclinal valleys'', Tributaries across anticlinal ridges'', `Fold axes →''. c (Sketch: Horizontal lines for fold axes) \\ --- --- --- (anticlines/ridges) \\ | | | (tributaries ) \\ ^^^^^ (synclinal valleys with main streams ) \\ --- --- --- \\

Question 2

7.3.1 A drainage pattern is the geometric configuration or spatial arrangement of a stream network and its tributaries in a drainage basin, controlled by factors such as geology, topography, rock resistance, and slope. 7.3.2 Drainage pattern A: Dendritic. Drainage pattern C: Parallel. 7.3.3 Drainage pattern A (dendritic) develops on uniform, horizontally bedded rocks with homogeneous resistance, allowing streams to form a branching, tree-like network without structural control. Drainage pattern B (trellis) develops on folded or tilted strata with alternating resistant and less resistant layers, where main streams follow weak layers in synclines and tributaries cut perpendicularly across resistant anticlines. 7.3.4 The streams in pattern C flow in a consistent direction due to a uniform topographic gradient or uniformly dipping bedrock strata, causing parallel stream channels to develop downslope on a consistent regional slope. 7.3.5 A trellis drainage pattern develops in a folded landscape. Simple labelled plan view sketch (description for drawing): Parallel elongated valleys (synclines) with long main streams flowing along them. Shorter tributaries join perpendicularly from adjacent ridges (anticlines). Label: `Main streams in synclinal valleys'', Tributaries across anticlinal ridges'', `Fold axes →''. c (Sketch: Horizontal lines for fold axes) \\ --- --- --- (anticlines/ridges) \\ | | | (tributaries ) \\ ^^^^^ (synclinal valleys with main streams ) \\ --- --- --- \\

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