The Northern Plains

In the Bhabar belt, river water percolates through highly porous deposits of pebbles and boulders. Farther south in the Terai, finer sediments and relatively lower permeability make this groundwater emerge again at the surface as springs and marshy water. Therefore, option C is correct. Option A is more closely associated with the Bhabar condition, not the Terai. Exam tip: rivers disappear in Bhabar and reappear in the marshy Terai belt.

Level land helps build roads and railways. Link plains with transport facilities in exams.

Floods may increase fertility by bringing fresh alluvium but also cause damage. In exams write both aspects.

River deposition occurs when a river loses enough energy to carry its load. In the Northern Plains, a river leaves the steep mountain valleys and enters a broad, gently sloping plain. Its speed generally decreases there, so it cannot carry as much sand, silt, gravel, and clay as before. The transported material is therefore dropped on the river bed, banks, or nearby floodplain.

Option A is correct because reduction of velocity directly encourages deposition. The other choices do not describe the main change that makes a river deposit its load: increasing sea salinity, a straighter mountain valley, or very hard rocks does not by itself explain the deposition in the plains. A river may also deposit material when its discharge falls or its channel becomes wider, but the given option identifies the essential relationship between lower speed and deposition.

Inundation and fresh alluvium are common signs of a floodplain. Identify floodplains by fresh deposits in exams.

Due to heavy water and sediment the Brahmaputra keeps changing channels and landforms. Remember it as more flood prone.

Rivers bring sediments from upper regions and deposit them in the plains. Distinguish source and depositional area in exams.

Alluvial soil level land and water availability strengthen agriculture. In exams mention all three reasons together.

Himalayan rivers deposited sediments for a long time so the alluvium is thick. Link thickness with long term deposition in exams.

The main difference between Bhangar and Khadar is linked with age height and flood deposits. Remember Bhangar as old and Khadar as new in exams.

The Northern Plains were formed by alluvial deposits of the Indus, Ganga and Brahmaputra systems. For exams, treat river deposition as the key basis.

In Bhabar, coarse pebbles allow water to seep underground. In exams, link Bhabar with a permeable belt.

Water absorbed in Bhabar reappears in Terai. For exams, remember Terai as a wet and marshy zone.

Rivers deposit fresh alluvium in flood plains which increases fertility. In exams, connect fertility with alluvium.

A Doab is alluvial land between two rivers. In exams, remember the Ganga-Yamuna Doab as an example.

The water divide near Ambala separates the Indus and Ganga systems. In exams, connect it with the division of plains.

The Punjab Plain was formed by deposits of the tributaries of the Indus system. In exams, link it with the Indus system.

The Ganga Plain mainly spreads across Uttar Pradesh, Bihar and West Bengal. In exams, treat it as a major part of the central northern plain.

Shifting Brahmaputra channels cause floods and river islands. In exams, remember unstable channels as a feature of the Brahmaputra Plain.

Kankar in Bhangar consists of calcareous nodules in old alluvium. In exams, remember kankar as an identifier of Bhangar.