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.
Most sedimentary rocks are formed by the lithification of weathered rock debris that has been physically transported and deposited. During the transport process, the particles that make up these rocks often become rounded due to abrasion or can become highly sorted.igure 10f-10: Gypsum. Several types of sedimentary rocks are formed from the lithification of once living organisms. Limestone deposits can be formed by the direct lithification of coral reefs, marine organism shells, or marine organism skeletons.