1. RAW MATERIALS, 2. RENEWABLE AND 3. NON-RENEWABLE ENERGY SOURCES

1. 2.1. Hidropower

1.1. hydropower plants use the force of water stored in reservoirs to generate electricity

2. 2.2. Solar or photovoltaic energy

2.1. the Sun emits a large amount of radiation that is inexhaustible, non-pollution and can be harnessed easily to produce electricity and heat, photovolatic solar panels are made form a special material that generates eletricity from sunlight

3. 2.3. Wind energy

3.1. is obtained by harnessing the force of the wind, it's a non-polluting energy, but wind turbines significantly alter the landscape and cause noise pollution.

4. 2.4. Geothermal energy

4.1. uses the heat form inside the Earth especially in areas with intense volcanic activity.

5. 2.5. Tidal energy

5.1. uses the movement of seawater caused by tides, waves and currents, it's very common.

6. 1.1. Raw materials of animal and plant origin

6.1. animal origin are used in the textile industry to make clothes.

6.2. plant origin is mainly used to produce fabrics, there are also forest products, which are used to make forniture and tyres.

7. 1.2. Raw materials of mineral origin

7.1. metals, must be extracted form metallic minerals, zinc, copper, chrome and lead are examples

7.2. non-metallic minerals are those form which other materials are obtained, including solfur, rock salt, gypsum and mica

7.3. rocks, such as granite, slate, clay sand and marble are used in construction, others are used to produce energy.

8. 1.3. Mines

8.1. mining refers to the process of extracting raw materials of mineral origin, there are underground and open-cast mines.

9. 3.1. Coal

9.1. a rock and a fossil fuel

10. 3.2. Oil

10.1. another fossil fuel with high calorific value.

11. 3.3. Natural gas

11.1. has a similar origin to oil.

12. 3.4. Nuclear energy

12.1. enriched uranium is the fuel used in nuclear reactors, which generate an enormous amount of electricity.