RAW MATERIALS AND ENERGY SOURCES
par Adri 1208
1. RAW MATERIALS
1.1. ANIMAL
1.1.1. Wool
1.1.2. Silk
1.1.3. Hides
1.2. VEGETAL
1.2.1. Cotton
1.2.2. Wood
1.2.3. Cork
1.2.4. Linen
1.3. MINERAL
1.3.1. Copper
1.3.2. Marble
1.3.3. Clay
1.3.4. Iron
2. Energy resources
2.1. Renewable
2.1.1. Solar energy
2.1.2. Wind energy
2.1.3. Tidal energy
2.1.4. Hydro energy
2.1.5. Geothermal energy
2.1.6. Biomass energy
2.2. Non-renewable
2.2.1. Coal
2.2.2. Oil
2.2.3. Natural gas
2.2.4. Nuclear