What is the general surface of the Northern Plains like?

Correct answer: Level and extensive

The direct answer is C: the Northern Plains have a level and extensive surface. These plains were built mainly by the deposition of alluvium brought by the Indus, Ganga, Brahmaputra and their tributaries. Repeated deposition spread fine sediments over a very broad area, making the land generally flat, although small local variations exist. A, rugged mountainous, describes mountain relief, especially the Himalayas, not the general surface of these plains. B, coral island-like, describes a special coastal or island environment and is unrelated to the alluvial Northern Plains. D, volcanic cone, is a steep cone-shaped landform produced by volcanic activity, not the broad depositional surface of the plains. Thus C is the most accurate general description. Memory cue: wide river deposits usually produce broad, level plains.