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2. The ancient Greeks believed that there were
four elements that everything was made up
of: earth, water, air, and fire. This theory was
suggested around 450 BC, and it was later
supported and added to by Aristotle

4. Fire has been used by humans for cooking,
generating heat, light, signaling, and
propulsion purposes. The negative effects of
fire include hazard to life and property,
atmospheric pollution, and water
contamination.

5. Solar is a powerful source of energy that
can be used to heat, cool, and light our
homes and businesses. Solar energy is an
important source of renewable energy.
Technologies are used to diversify other
energy sources, improve efficiency , save
money and reduce pollution.

6.  The solar energy development in Greece
started in 2006 and was skyrocketed from
2009 onwards because of the high feed-in
tariffs introduced and the corresponding
regulations for domestic applications of
photovoltaics (PV) on rooftops.
 Development of solar power in Greece has
been proposed as a way of getting Greece out
of debt.

8. The earth is full of a wide variety of rocks
and minerals which provides the soil to grow
vegetation and support life.

9. Geothermal energy is thermal energy
generated and stored in the Earth. Thermal
energy is the energy that determines the
temperature of matter. The adjective
geothermal originates from the Greek roots
γη (ge), meaning earth, and θερμος
(thermos), meaning hot.

10. Biomass energy is another renewable
resource of energy which comes from plants
and plant-derived materials. Biomass can be
used for fuels, power production, and
products that would otherwise be made from
fossil fuels.

12. Water is a transparent fluid which forms the
world's streams, lakes, oceans and rain, and
is the major constituent of the fluids of living
things. Water is a liquid , but it often co-
exists on Earth with its solid state, ice and
gaseous state.

13. Hydropower or water power (from the Greek:
ύδωρ, "water" ) is power derived from the
energy of falling water and running water,
which may be harnessed for useful purposes.
Hydropower is a renewable energy source.

15. The common name given to the atmospheric
gases used in breathing and photosynthesis
is air. Although air content and atmospheric
pressure vary at different layers, air suitable
for the survival of terrestrial plants and
terrestrial animals currently is only known to
be found in Earth's troposphere and artificial
atmospheres.

16. Wind power is extracted from air flow using
wind turbines or sails to produce mechanical
or electrical power. Wind energy as an
alternative to fossil fuels, is plentiful,
renewable, widely distributed, clean,
produces no greenhouse gas emissions
during operation and uses little land.