Humus
• The decayed material in soil
Mineral
• A nonliving substance in the form of a crystal which is taken form the earth
geologist
A science tist who studies the earth
crystal
• The substance with smooth flat surfaces that meet that in a sharp edged and corners
gems
• a rare valuable minerail
subsoil
• the soil beneath the layer of soil
bedrock
• the layer below the topsoil part of earth crust
crust
• The solid of rock beneath the soil
magma
• hot liquid rock within the earth
core
• The innermost part of earth
mantle
• The layer of earth beneath the crust