1. WATER
Let’s know, let’s love, let’s
protect our environment
Comenius project 2013-2015
By Nejc Grbec and Gašper Jugovac from Izola,
Slovenia
2. INTRODUCTION
In this presentation we are going to talk about water.
The authors of this presentations are the two of us: Gašper J. and Nejc G.
We hope you will enjoy the presentation
3. GENERALLY ABOUT WATER
We can find water in 3 different states
Water molecule:
Liquid state
Oxygen
Hydrogen
Hydrogen
Ice
Steam
4. WATER ON EARTH
Water is vital for all known forms of life.
It covers 71% of Earth's surface.
On Earth, 96.5% of the planet's water is found in seas and
oceans, 1.7% in groundwater, 1.7% in glaciers and the ice caps
of Antarctica and Greenland and 0.001% in clouds, fog and
water vapor (steam).
Only 2.5% of Earth's water is freshwater.
Water on Earth moves continually through the water cycle of
evaporation and transpiration (evotranspiration).
5. SEA WATER
Sea water contains about 3.5% salt on average, plus smaller amounts of
other substances.
The salinity of water in major seas varies from about 0.7% in the Baltic
Sea to 4.0% in the Dead Sea.
It freezes at a lower temperature than fresh water (about −1.9 °C).
We can find salt water in seas and oceans.
6. FRESH WATER
We can find it in lakes, rivers …
It freezes at a higher temperature than salt water (0°C)
We use it for washing things, cooking , drinking, for
agriculture, transport …
7. STEAM
Steam is a term for the gaseous phase of water, which is formed when
water boils (100°C).
We use steam for sterilization in agriculture, for cleaning , producing
electricity in steam turbines …
Old locomotives and machines produced steam, too.
8. ICE
Ice is water frozen into a solid state.
We use ice for sports like:
Ice hockey
Curling
Bobsled
Skeleton
We can use ice for cooling down drinks, for creating sculptures, for
conserving food …
