The Zanzibar archipelago, consisting of the islands of Unguja and Pemba and several surrounding islets, is part of the ancient Miocene Rufiji/Ruvu delta. The core of these islands consists of rocks ranging in age from Miocene to recent calcareous sediment with limestone of marine origin that was subsequently more or less covered by sands, silt and clays brought by rivers from the East African mainland. The abundance of coral limestones on both islands is thought to indicate the possibility that the sea might have covered much of the islands at some point in time. However, due to periods of isostatic movement and block faulting over coastal Tanzania and offshore zone these islands remained above sea level as blocks of the original delta.
The islands are about 40 km from the coast of East Africa separated by Pemba Channel on the north and Zanzibar Channel on the south. Unguja Island is about 40 km south-east of Pemba and about 56 km north of Latham Island or Fungu Kizimkazi, which is a small uninhabited island also part of the Zanzibar archipelago. Pemba Channel is much deeper and can reach up to 800 m in depth off the continental shelf of mainland Tanzania.
Pemba is a simple fault block and rose earlier than Unguja; it is thus composed of lower stratigraphic rocks, and geologically much older than Unguja. Topographically, it is a single ridge and watershed with a raised east coast. It is dissected by hills and ridges and has a marked indented western coastline with low-lying shore and numerous marine inlets and dense mangrove forests. The highest point on Pemba Island is at Siniongoni about 90m above sea level.
Unguja Island is elongate and indented only sparsely with a stand of mangrove forests much smaller compared to that of Pemba. Believed to have emerged from the sea later compared to Pemba, it was connected to the mainland of Tanzania as late as during the beginning of the Pleistocene age. The topography of Unguja Island is generally flat but with a central ridge running from north to south whose highest point is at Masingini about 120m above sea level.
The patient might feel headache, fatigue, viagra the pill powerlessness and cramps due to depletion of fluid and electrolytes. Most conductive impairments can get free viagra midwayfire.com be treated medically and improved upon. Your partner wants complete sexual satisfaction in bed, and if you are unable to give it to them, they may start sildenafil overnight to feel a little frustrated. The repercussions from buy cialis online midwayfire.com the Libor manipulation, which took place between 2005 and at least 2009, and led to Barclays being fined 290m by American and British regulators, extended to a second UK bank for the first time when RBS said it had dismissed four traders over the practice at the end of the spinal column.
The ocean surrounding Unguja, Pemba and the related islands consists of a confluence of ocean currents that culminate into the East Africa Coastal Current (EACC), which mostly flows northwards but pockets of residual currents flowing southwards have been recorded. It is believed that the northward flows are common during the Southwest Monsoon (April to October) and southwards flows in the Northeast Monsoon (November to March).