Soil and its porosity
Soil |
Porosity |
Sandy soil |
30-50 % |
Medium soil |
35-60 % |
Clay soil |
30-65 % |
Examples of some rocks
- Igneous rock: Pegmite, Granite, Basalt, etc.
- Metamorphic rock: Marble, Gneiss from granite and slate from shate.
- Sedimentary rock; Sandstone, Shate, Limestone and conglomerates.