Deposition develops a floodplain just as erosion makes valleys. Floodplain is a major landform of river
deposition. A river bed made of river deposits is the active floodplain. The floodplain above the bank is
inactive floodplain. Natural levees and point bars are some of the important landforms foun d associated
with floodplains.
Point bars are also known as meander bars. They are found on the convex side of meanders of large
rivers and are sediments deposited in a linear fashion by flowing waters along the bank. They are almost
uniform in profile and in width and contain mixed sizes of sedime nts. If there more than one ridge,
narrow and elongated depressions are found in between the point bars. So, Statement 1 is correct.
Barrier bars are long, narrow ridges of sand or shingle that form parallel to the coast in the near shore
zone. They are created by the action of waves and currents that deposit sediments. Normally, bars are
submerged under water, but when they rise above the water surface, they are called barrier bars. If a
barrier bar becomes attached to the mainland at one end, forming across the mouth of a bay, it is called
a spit. When barrier bars and spits fully block off a bay, they can create a lagoon, which over time may
fill with sediments to form a coastal plain. Thus, Barrier Bars are depositional landforms. So,
Statement 2 is correct.
River terraces are surfaces marking old valle y floor or flood plain levels. They may be bedrock surfaces
without any alluvial cover or alluvial terraces consisting of stream deposits. River terraces are basically
products of erosion as they result due to vertical erosion by the stream in to its own depositional
floodplain. There can be a number of such terraces at different heights indica ting former river bed
levels. The river terraces may occur at the same elevation on either side of the rivers in which case they
are calle d paired terraces. Thus, River terraces are not depositional landforms. So, statement 3 is not
correct.
Barchans are crescent-shape d de positional landforms formed by wind action in deserts. They develop
where winds are strong, steady, and the surface is flat and dry. Their horns or tips point downwin d
(away from the wind). Barchans are formed when sand supply is limited, and they move slowly over
time with the wind. They are common in arid and semi -arid regions. So, Statement 5 is correct.
Eskers are long, winding depositional landforms made of sand, grave l, and boulders, formed by streams
flowing beneath glaciers. As the glacier melts, these sediments are deposited in the ice tunnels and,
after complete me lting, appear as sinuous ridges on the land surface. Eskers can stretch for several
kilometres and indicate the path of ancient glacial melt water streams. They are often found in formerly
glaciated regions and can vary in height and width depending on the size of the stre am and sediment
load. So, Statement 6 is correct.
Dolines are erosional landforms found in limestone (karts) areas. They are funnel-shaped depressions
formed mainly by the solution of limestone or by the collapse of caves beneath the surface. Dolines are
also called sinkholes and can vary in size from a few mete rs to over a hectare. So, Statement 4 is not
correct.