Melbourne property prices have passed Sydney as the nation's fastest growing, although they still lagged well behind in terms of absolute cost. Melbourne's year-on-year dwelling price growth of 11 per cent is the nation's fastest. Sydney's annual property price growth of 10.5 per cent is the slowest in 29 months. Less than half the properties auctioned in Sydney over the weekend sold.
How Is Chalk Formed. Chalk is a soft, white, porous sedimentary rock, a form of limestone composed of the mineral calcite. It forms under relatively deep marine conditions from the gradual accumulation of minute calcite plates (coccoliths) shed from micro-organisms called coccolithophores. It is common to find flint and chert nodules embedded in chalk.
Sedimentary rocks are formed from grains of minerals and rocks, dissolved minerals and other material, such as plant matter or animal remains, which have been transported and deposited as sediment.lant material can be found as fragments in sandstones or other sedimentary rocks, and if it makes up the bulk of the rock it is termed coal. The shells of many marine organisms are made of calcium carbonate, and form limestone or calcite-rich sediments such as marl (a calcareous mudstone).