SAND

The loose material made by the sand quartz grain (sand grain), such as the delta or sandstones. Sand granules are mostly silicon, but sometimes chuny, gypsum-rich or originally volcanic. Because the sandstones are mainly produced by the quartz, pelted rocks, or due to the crystalline rocks, their size ranges from 0.05 to 2.00 millimeters. After the scattering of the rock, the balikanas are mainly transported by water, glacier or air. The amount of girl child in different types of soil is different. There is a maximum amount of silica in gross balloons but there is potassium, calcium and phosphorus in fine clay. In the category of Soil particles, according to the USDA system, the thick, thin, medium, refined and sub-climax ranges range from 1.00 to 2.00, 0.10 to 0.50, 0.25 to 0.50, 0.10 to 0.25 And 0.05 to 0.10 mm. But in the international classification of the soil particles, the girl is divided into two groups, namely - gross (0.20 to 2.00 millimeters) and fine (0.02 to 0.20 millimeter) balikana. The thick sand clay is important from the structural side, because these particles affect water and air penetration. Since the sand is composed of comparatively precise elementary minerals, their importance in supply of nutrients is very less and less, and more often, the presence of more girls usually reduces the adhesion and flexibility of the soil and the soil is fragile and soft. Sowing of sandy soils can be easily done in the field of agriculture.

SAND

Bangladesh is fairly rich in terms of sand and poly sediments. Although sandalwood is present in all the soil of Bangladesh, the old Himalayan subsoil plains are in the basin of the soil, some parts of the Old Brahmaputra Floodplain and sand deposits in the western flanking area in the Gangetic plain. Sand is also found in the Brahmaputra-Jamuna river area. These sand is used as a standard and plaster and full complementary material. Every year during the monsoon, new sand deposits are stored in these areas. Due to the extraction of these sand from the river, the rivers are easily accessible for water flow. Moreover, it creates opportunities for local people to work. As a result revenue revenues of the government increased. But due to the influence of the tides of the Meghna and Karnaphuli rivers, sand and sediments are slightly saline. As a result, sand in these areas has low quality.