A good description of soil porosity and how it is measured. There are links to mixing soil, aerating soil, and soil settling with rain.

Permeability is the degree to which water or other liquids are able to flow through a material. Different substances such as soil, gravel, sand, and asphalt have varying levels of permeability. In this activity, students will explore...

Students measure the permeability of different types of soils, compare results and realize the importance of size, voids and density in permeability response.

Students learn how water moves through rock materials such as sand, gravel, and clay.