Soil
af Emily Smith
1. descriptions
1.1. full of different materials and organic matter
1.2. very thick
2. layers
2.1. topsoil
2.2. subsoil
2.3. parent material
2.4. bedrock
3. is made of
3.1. weathered rocks
3.1.1. sand
3.1.2. silt
3.1.3. clay
3.2. organic matter
3.2.1. made of
3.2.1.1. nutrients, animal and plant residue, cells of soil microorganisms
3.2.2. definition
3.2.2.1. is matter composed of organic compounds that has come from the remains of organisms such as plants and animals and their waste products in the environment