An explanation of symbols on map?

• A. Legend
• B. Halftone
• C. Intermittent River or Lake
• D. Hydrography

Answer: (A)

The main idea is that maps include a legend to explain the symbols and colors used. The legend is the key that tells you what each mark on the map represents, so you can read features correctly—roads, rivers, forests, elevation marks, boundaries, and more. Without it, symbols are just shapes you can’t interpret, making the map unreliable for understanding real-world features or for comparisons. A legend often also notes any color schemes or line styles used to distinguish different kinds of information.

The other terms describe things related to map creation or content rather than how symbols are interpreted. Halftone refers to a printing/shading method used to simulate tones; an intermittent river or lake is a specific feature that might be shown on a map; hydrography is the study of bodies of water.