Fresh or salt water?

"The cure for anything is salt water: sweat, tears, or the sea." Isak Dinesen.
 
Viewing the Earth from space you can see the enormous blue expanse covering about three quarters of our planet.
 
The water that covers the Earth is contained in oceans and seas, glaciers and streams and of all this water, around 97% is salt water. Most of the waterways flow into the sea: when rainwater runs on the ground, it dissolves part of the mineral salts contained in the rocks – transporting water rich in mineral salts to the sea. The mineral salts are then deposited for billions of years and the water therefore becomes salty. The sun evaporates part of the water which generates clouds that are ready with rain. Despite the evaporation of the water, the sea still remains constantly salty.
 
Fresh water originates from the springs which supply the streams and rivers, and from icy water of the polar ice caps. It is this soft water that our survival depends on: the water needed to quench our thirst, wash ourselves and cook.
 
Everything on our planet is in perfect balance and tipping the scales is detrimental to our future. This is why it is so important to intervene to protect the environment, to preserve the natural habitats and the Earth’s biodiversity. Global warming melts an excessive amount of ice from the polar ice caps, the sea level rises, the salinity of the water changes and the currents can even alter. Maintaining this balance is critical for the survival of animal species throughout the world.