Exposé d'anglais: l'eau
1890 mots
8 pages
Water: Source of Life Good morning, I'm going to talk about the water which is the source of life.
There are six/seven parts to my presentation.
Firstly, the terrestrial origins of the water
Secondly, the water in the world
Thirdly, water from a scientific perspective
Fourthly, natural cycle of water
Fifthly, potable water cycle
Sixthly, water pollution.
Finally, pollute less ... a few little things easy
By the end of my presentation you will have an another conception of water. "Water is not necessary to life, it is life. " Water is the origin of life on earth.
It is essential to our body and everything around us.
Water is essential to life, full of qualities and benefits to find out ...
A world without water, can you imagine?
1)Terrestrial origin:
Origin of Earth's water:
The universe was born there about 15 billion years, our planet Earth is now aged 4.6 billion years. Hot sphere after its formation, Earth has released gases including water vapor.
This water vapor condenses formed the hydrosphere and caused heavy rains that have streamed over millions of years.
Gradually, water covered the 3 / 4 of the earth's surface. That's more or less a volume of 1.4 billion km3. That's why we qualify Earth "Blue Planet".
Water has conditioned the emergence of life, there are about 3 billion years.
The first living beings who are the unicellular organisms, have evolved in the oceans.
Over millions of years these creatures have multiplied and transformed to become gradually fish, reptiles, birds, mammals ...
And when our body is formed in the womb of our mother, he bathed in the water! Water, that's life!
2)The water in the world:
Nearly 97% of the water is warming in the seas and oceans.
This water is too salty to be consumed.
Indeed, man does not drink and uses only fresh water, that is unsalted water.
Fresh water is water from glaciers and ice shelves. Water that is unfortunately unusable in its natural state because it is