World Soil Day (WSD) is held annually on 5 December as a means to focus attention on the importance of healthy soil and to advocate for the sustainable management of soil resources.
Find out more about World Soil Day here: World Soil Day | United Nations
Family activity free download here: Salty experiments with soil for children and guide for teachers (fao.org)
…and a local perspective on soils here: https://youtu.be/gHfEHu6zZUE