The altitude of a point from sea level shown on a map is called:

Question

Accepted Answer

The altitude of a point from sea level shown on a map is called a Spot Height.

Here's why Option 3 is correct and the others are incorrect:

*   **Option 3: Spot Height (Correct)** A spot height is a specific point on a map that has its altitude (height above sea level) clearly marked. These are usually indicated by a dot or a small triangle with the elevation value written next to it. They provide precise altitude information for that exact location. This directly answers the question.

*   **Option 1: Layer Colouring (Incorrect)** Layer colouring, also known as hypsometric tinting, uses different colours to represent different ranges of elevation. While it *indicates* altitude generally, it doesn't give the precise altitude of a *specific point*. It shows altitude zones, not individual point heights.

*   **Option 2: Hachures (Incorrect)** Hachures are short lines drawn on a map to show the direction and steepness of slopes. They are a form of hill shading and provide a qualitative representation of terrain, but they do not directly indicate the altitude of a specific point above sea level. They show relative relief, not absolute height.

*   **Option 4: Bench Mark (Incorrect)** A bench mark is a permanently fixed point of known elevation, often marked by a metal plate or marker set into a durable object. While bench marks are used as reference points for surveying and determining elevations, they are not the general term for any altitude shown on a map. They are specific, established points, not just any altitude marking.