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LECA is usually produced in different sizes and densities from 0.1 millimetres (0.004 in) up to 25 millimetres (1.0 in), commonly 0–4 mm, 4–10 mm, 10–25 mm and densities of 250, 280, 330, and 510 kg/m 3. LECA boulder is the biggest size of LECA with 100–500 mm size and 500 kg/m 3 density.
National Curriculum and Textbook Board traces its origins to the East Pakistan School Textbook Board which was established in 1954. In 1971, the Bangladesh School Textbook Board was established. In 1976 it was constituted as the National Curriculum and Syllabus Committee and the National Curriculum Development Centre was established in 1981.
Bangladesh's largest opposition party, the Bangladesh Nationalist Party, denounced the Chhatra League attacks on the protesters. [398] The Left Democratic Alliance also denounced the suppressions saying, "the government is delivering provocative speeches instead of recognizing logical changes in the quota system."
In May 1985, for example, a severe cyclonic storm packing 154-kilometre-per-hour (95.7 mph) winds and waves 4 metres (13.1 ft) high swept into south-eastern and southern Bangladesh, killing more than 11,000 persons, damaging more than 94,000 houses, killing some 135,000 head of livestock, and damaging nearly 400 kilometres (248.5 mi) of ...
The coastal region of Bangladesh is especially prone to cyclones. [28] Between 1793 and 1996, there has been one cyclone about every 4.5 years. This has a detrimental effect on the local environment, as well as on families and their property. For instance, a cyclone that hit in 1970 caused 300,000 deaths and US$86.4 million of property damage. [28]
There are 166 tea estates in Bangladesh, covering almost 280,000 acres of land. Bangladesh is the 9th largest Tea producer, producing around 2% of the world’s Tea production. Because of Bangladesh's fertile soil and normally ample water supply, rice can be grown and harvested three times a year in many areas. [3]
This ministry prepares and implements development projects on flood control, irrigation and drainage, prevention of riverbank erosion, delta development, land reclamation, etc. through the construction of barrages, regulators, sluices, canals, embankments, rubber dams, flood control dams, coastal embankments and canals.
BN Hydrographic & Oceanographic Center (BNHOC) is an agency for producing, procuring and distributing navigational charts, publications, Electronics Navigational Charts(ENC), BN Tide Table, BN BM Book to BN ships and establishments as well as maintenance of hydrographic, oceanographic, cartographic, meteorological and data processing instrument/equipment. [1]