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

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

GENERALLY ABOUT WATER We can find water in 3 different states

Water molecule:

Liquid state

Oxygen

Hydrogen

Hydrogen

IceSteam

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).

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.

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 …

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.

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 …