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

The high ridge that separates two drainage basins is known as a divide. This geographical feature prevents water from one basin flowing into the other.

A watercourse that joins a larger river is referred to as a tributary. This term signifies a smaller stream that feeds into a larger body of water.

The sketch illustrates a dendritic drainage pattern, which resembles the branches of a tree and is commonly formed in areas with uniform materials.

The stream order at point X is classified as first order, which indicates it is the smallest stream in the hierarchy that has not yet received water from another stream.

The high drainage density of the basin can be attributed to steep slopes and low permeability. Steep slopes allow for rapid runoff, while low permeability means less water can seep into the ground.

The tributaries typically join the main stream at acute angles, facilitating effective water flow and drainage towards the river.

This drainage pattern is often found in regions with resistant rock types and areas that experience limited rainfall, allowing rivers to carve out distinct paths.