Water is a transparent liquid that is the main constituent of Earth's streams, lakes, oceans, and rain, and makes up most of the fluids within living things. A water molecule consists of two hydrogen atoms and one oxygen atom connected by covalent bonds. On Earth, water exists in three states: as a liquid at standard temperature and pressure, as a solid in the form of ice, and as a gas (water vapor).

2. 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. As a chemical compound, a
water molecule contains one oxygen and
two hydrogen atoms that are connected by
covalent bonds. Water is a liquid at
standard ambient temperature and pressure,
but it often co-exists on Earth with its solid
state, ice; and gaseous state, steam (water
vapor).

4. hydrogen atoms(H2) and one oxygen atom, that is shown by the following

5. Division of mineral water according to its
chemical composition:
●highly carbonated natural mineral water -
healing, specific, containing the at least
1000 mg/dm of the free carbon dioxide
(CO2);

6. ●silicon water - healing, specific,
containing the at least 100 mg/dm of acid
(H2SiO3);

7. ●carbonic water - healing, specific,
containing by 250 ³ mg/dm to 999 mg/dm
of the CO2 and sodium (Na+), equals at
least 20% mval each;

8. ●bromide water - healing, specific,
containing the at least 5 mg/dm of the
bromide ion (Br-);

9. ●chalybeate water - healing, specific,
containing the at least 10 mg/dm of the
ferrous ion (Fe2 +).

10. GROUP 1
Anna Woszczyk - Poland
Maja Gewald -Poland
Natalia Baczewska - Poland
Noelia Afonso Martín - Spain
Gorka Arnay Esteban - Spain
María Samara Ascanio Castro - Spain
Lucía Castañeda Benites - Spain
Andrea Candelaria Domínguez Medina - Spain
Adil José El Founti Afonso - Spain
Philip - Germany