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.
Idaho. Home alone age: none. No law for leaving child in car. Illinois. Home alone age: A minor must be at least fourteen years old to stay home alone. Full law here. Car law: No child that is six years of age or younger may be left in a car for longer than ten minutes, unless he or she is under the supervision of a person fourteen years of age or older.