Soil is formed from the weathering of rocks and minerals. The surface rocks break down into smaller pieces through a process of weathering and is then mixed with moss and organic matter. Over time this creates a thin layer of soil. Plants help the development of the soil.
In NSW it is a different story. It provides guidelines to parents and says a child aged 10-12 years can be left for up to 12 hours but not between 10pm and 6am. They must have a back-up adult available and can look after one or two other smaller children.
Home alone age: none. Car law: No child under six years of age can be left in a car alone when the person responsible is more than ten feet away and out of sight of the car, unless a person ten years of age or older is also present in the car. Full law is below. RS 32: Â§295.3.