2.1 A river and its tributaries is known as .. - English General - NSC Geography - Question 2 - 2023 - Paper 1

The high-ridge area separating two drainage basins is referred to as a 'divide'. It is the geographical feature that determines the direction in which waters flow into different basins.

A stream that joins a larger river's basin is known as a 'tributary'. Tributaries contribute to the flow and volume of the main river.

The sketch represents a 'dendritic drainage pattern', characterized by a branching pattern similar to tree roots and is commonly found in regions with uniform materials.

The stream order at point X is 'first order' if it is a source tributary, which has no tributaries of its own.

'Steep slopes' and 'hard rock' are factors influencing high drainage density as they promote rapid runoff and increased surface water flow.

Tributaries typically 'join the main stream at an acute angle', enhancing water flow and contributing to the main river's velocity.

This drainage pattern is typically found in regions of 'resistant rocks' and 'humid climates', where erosion shapes the landscape favorably for such patterns.

The valley generally has 'deep V-shaped features' indicative of youthful erosion and 'narrow formations' due to gradual river actions cutting through the landscape.

A waterfall is a geological feature where water cascades over a vertical drop or cliff, creating a significant change in elevation and often distinguishing the upper and lower river courses.

In sketch A, the 'hard rock' is represented by 'Y', and the 'soft rock' is depicted by 'Z', with erosion mainly affecting the less resistant rocks.

Erosion at a waterfall affects its structure by undercutting the harder rock layer, causing sections to collapse, which shapes the waterfall over time.