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.
1 Today, the Aswan Dam keeps the Nile from flooding modern cities. 2  The Ancient Egyptians called the Nile the Aur, which means black and comes from the black soil. 3  The Egyptians measured the height of the annual flood using a Nilometer.
Until the Aswan High Dam was built, Egypt received a yearly inundation-an annual flood-of the Nile.The ancient Egyptians did not realise this, but the flood came due to the heavy summer rains in the Ethiopian highlands, swelling the different tributaries and other rivers that joined and became the Nile.ntil the Aswan High Dam was built, Egypt received a yearly inundation-an annual flood-of the Nile.