Kent coastline of Kent is continuously changing, due to tectonic uplift and coastal erosion. Until about 960, the Isle of Thanet was an island, separated by the Wantsum channel, formed around a deposit of chalk; over time, the channels silted up with alluvium. Similarly Romney Marsh and Dungeness have been formed by accumulation of alluvium. Kent's principal river, the River Medway, rises near East Grinstead in Sussex and flows eastwards to Maidstone. Here it turns north and breaks through the North Downs at Rochester, then joins the estuary of the River Thames as its final tributary near Sheerness. The Medway is
Rochester Grammar School Rochester Grammar School Rochester Grammar School (known as Rochester Grammar School for Girls until 2006) often abbreviated to RGS is a grammar school for the education of girls between the ages of 11 and 18. It has academy status. Pupils are expected to perform highly throughout the school. It is now known as just "Rochester Grammar School" following the introduction of boys into the sixth form. Rochester Grammar School is located on Rochester Maidstone Road, opposite the Sir Joseph Williamson's Mathematical School. Their sixth form is mixed but the rest of the school is single-sex. Last year's results moved them