As part of our Rocks, Relics and Rumbles topic, we have been studying how the Earth is formed. After identifying the layers of the Earth (Crust, Mantle, Outer Core and Inner Core), and the types of rocks that can be found around our planet, we began to think about what the ground around us is made up of and researched facts about the different types of soil that we might find.
We found that some soils like sand and silt, let water drain through them because they are PERMEABLE. However, some types such as clay, held water more (IMPERMEABLE), thereby affecting any plant growth. Soils good for growing plants need to be permeable enough to let excess water escape, but still be able to hold the important nutrients that plants need. Loam is therefore an ideal soil for our gardens!
Next, in small groups, using Google Maps, we identified 5 different areas around the North, East, South and West of our school site and created a fair test by digging holes 10 cm deep, to collect a sample of the soil at each location. Using the Method and Flow Diagram below – we were able to work out what type of soil it was.
Why do you think most of the samples around our school were identified as clay soil?