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.
Laws change form place to place but the average age is 12-13 years.   It is not so much a factor of the weight of the child. Diamaler  Chrysler like any other car company â¦ , states that the children under  12 years old need to stay in the back seat with a seat belt and or  proper child restraints.