Question: what kind of soil is there in sundarbans

title: Sundarbans
text: Biotic factors here play a significant role in physical coastal evolution , and for wildlife a variety of habitats have developed which include beaches , estuaries , permanent and semi-permanent swamps , tidal flats , tidal creeks , coastal dunes , back dunes and levees . The mangrove vegetation itself assists in the formation of new landmass and the intertidal vegetation plays a significant role in swamp morphology . The activities of mangrove fauna in the intertidal mudflats develop micromorphological features that trap and hold sediments to create a substratum for mangrove seeds . The morphology and evolution of the eolian dunes is controlled by an abundance of xerophytic and halophytic plants . Creepers , grasses and sedges stabilise sand dunes and uncompacted sediments . The Sunderbans mudflats ( Banerjee , 1998 ) are found at the estuary and on the deltaic islands where low velocity of river and tidal current occurs . The flats are exposed in low tides and submerged in high tides , thus being changed morphologically even in one tidal cycle . The tides are so large that approximately one third of the land disappears and reappears every day . The interior parts of the mudflats serve as a perfect home for mangroves . See