Water covers 71% of the Earth’s surface and thatis why Terra is also named The Blue Planet. Planet
On Earth, 96.5% of the planets water is found in oceans, 1.7% in groundwater, 1.7% in glaciers and the ice caps of Antarctica and Greenland and a small fraction in the air as vapor, clouds and precipitation.Only 2.5% of the Earths water is freshwater and 98.8% of that water is in ice and groundwater.Water appears in nature in all three common states of matter and may take many different forms on Earth:• water vapor and clouds in the sky,• seawater and icebergs in the polar oceans,• glaciers and rivers in the mountains,• the liquid in aquifers in the ground.
Water is present in all Earth’s structures, starting with the vegetal cell andbeing part of the animal cell too. Without water any particular metabolic process could not exist. The human body contains 72% water. 75% of the human brain is also water. A living tree consists of 75% water.
The beauty of water is unique in its ability of taking different forms…
“Water, thou has no taste, no colour, no odor, it cannot bedefined, art relished while even mysterious, not necessary to life but rather life itself.” Antoine de Saint-Exupery
• Diseases caused by polluted waters and the lack of hygiene
Water pollution• Water pollution means any physical or biological change in the quality of water.• Rivers are the most affected by pollutants.• The main causes are: the industrial development, chemicals used in agriculture, the growth of population in cities.
Industrial pollution• Most water pollutants are produced by the food industry, the metal and the paper industry.Chemical pollution• The use of fertilizers in agriculture affects water and groundwater. All life forms are also affected.
Radioactive Pollution• A lot of rivers from Ukraine, Russia and Japan are polluted by radioactive substances from the atomic plants.Domestic sewage is 99.9% pure water and 0.1% are pollutants.
Industrial pollution on Chang Jiang River (China)
The explosion from Fukushima Power Plant (Japan, March 11, 2011) has radioactively polluted the air and the ocean.
Pollution in the ocean directly affects ocean organisms and indirectly affects human health and resources.• Oil spills, toxic wastes and dumping of other harmful materials are all major sources of pollution in the ocean.• The two main causes of oil pollution in the ocean are big ships leaking oil or ships carrying oil crashing into things in the ocean.
Attention to water!It cannot be made! What can you do for saving water?
Check your taps to see if there are any leaks!Have a short shower instead of a long bath!
Change your taps with water-saving ones!Turn off the running water while brushing your teeth or shaving yourselves!
Wash your vegetables in a bowl full of water! Use your washing machine or your dishwasher fully loaded!Wash your car early in the morning in order to avoidwater evaporation, you will use less water this way!
Use drip irrigation in agriculture!This way, NO! This way, YES!
“In nature there are neither rewards nor punishments; there are consequences.” (Robert G. Ingersoll) Realized by the pupils of School number 1, Bicaz, Romania, for the Comenius Project “How schoolchildren can contribute to keeping our planet green and clean” This project has been funded with support from the European Commission. This presentation reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein.