science

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

topsoil

The upper layer of soil

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