On a rainfall distribution map, dark colours generally indicate what?

Correct answer: High rainfall

A rainfall distribution map uses colours to show how much rain different places receive. In most school maps, the legend or key assigns darker shades to larger rainfall values and lighter shades to smaller values, although the exact colour order can vary between maps. The legend is therefore essential; a colour has no fixed meaning unless the map explains it.

Choice A is correct in the usual map convention given here: dark colours indicate high rainfall. They do not automatically mean snowfall, desert wind, or zero rainfall. A careful student should first inspect the scale and units, such as millimetres per year, before interpreting the map. If a particular map uses an unusual colour scheme, its legend takes priority. In this question, the expected convention and supplied answer are clear and accurate.