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.
Description. The cliffs around Old Harry Rocks are made of chalk. Wave refraction causes erosion of the headland and deposition in the bays either side. The cliffs are eroded when waves undercut the land causing the rock above to collapse. Caves are formed where cracks in the chalk are expanded due to hydraulic action.Caves can open up through the cliff to form arches, and the collapse of arches results in stacks such as Old Harry Rocks.he cliffs are eroded when waves undercut the land causing the rock above to collapse. Caves are formed where cracks in the chalk are expanded due to hydraulic action. Caves can open up through the cliff to form arches, and the collapse of arches results in stacks such as Old Harry Rocks.