Once a person is affected by a dengue virus, the platelets can no longer âactivateâ itself. So whenever there is damage, the platelets cannot form the mesh structure and the blood flows out of the vessel. As blood flows out, so does the platelets. This causes the platelet count to fall drastically. The blood that flows out causes internal. and external bleeding and leads to a haemorrhage.
The people of Egypt used the regular event of the River Nile flood to their advantage. Until 1970, the Nile had flooded every Spring as the mountain snows melted. This flooding of the flat land (floodplains) alongside the river enriched the soils leaving behind rich silt in which crops could be grown.
Flood plains, Levees and Yazoo streams. Rivers flood on a regular basis. The area over which they flood is known as the floodplain and this often coincides with regions where meanders form. When rivers flood in the middle valley the cover an area of land known as the flood plain.When they flood velocity is slowed and deposition of any rocks being transported is encouraged.lood plains, Levees and Yazoo streams. Rivers flood on a regular basis. The area over which they flood is known as the floodplain and this often coincides with regions where meanders form. When rivers flood in the middle valley the cover an area of land known as the flood plain.