In an ionic solid the the anions B- have a simple cubic lattice while the cations A+ are present at the centre of all edges of the unit cell .What is the formula of the unit cell.
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The Indus civilization was roughly contemporary with the other riverine civilisations of the ancient world: Egypt along the Nile, Mesopotamia in the lands watered by the Euphrates and the Tigris, and China in the drainage basin of the Yellow River and the Yangtze. By the time of its mature phase, the civilisation had spread over an area larger than the others, which included a core of 1,500 kilometres (900 mi) up the alluvial plain of the Indus and its tributaries. In addition, there was a region with disparate flora, fauna, and habitats, up to ten times as large, which had been shaped culturally and economically by the Indus.[26][m]
Around 6500 BCE, agriculture emerged in Balochistan, on the margins of the Indus alluvium.[5][n][27][o] In the following millennia, settled life made inroads into the Indus plains, setting the stage for the growth of rural and urban human settlements.