In the US, the most common size is 8 in Ã 8 in Ã 16 in (20 cm Ã 20 cm Ã 41 cm); the actual size is usually about 3/8 in (1 cm) smaller to allow for mortar joints. Cinder blocks differ from concrete blocks in their aggregate content.
Geography of Seychelles. The Seychelles is a small island nation located in the Indian Ocean northeast of Madagascar and about 1,600 km (994 mi) east of Kenya. Seychelles lies between approximately 4ÂºS and 10ÂºS and 46ÂºE and 54ÂºE.
The outer islands of the Seychelles are mostly uninhabited, making it perfect for advanced divers. Several locations in the Seychelles have PADI dive centers (PADI is a diving society for certified Scuba divers.), and several hotels teach diving to beginners and veteran divers.Divers do not have to go to the outer islands for diving, however. The inner islands offer plenty of diving too.everal locations in the Seychelles have PADI dive centers (PADI is a diving society for certified Scuba divers.), and several hotels teach diving to beginners and veteran divers. Divers do not have to go to the outer islands for diving, however. The inner islands offer plenty of diving too.