1. Water Supply and Pollution
By: Allie Bauer

2. Limited Water Supply
The reason humans have a limited water supply is because earth has a lot of ice and it’s most plentiful water resource, oceans
97% of earth’s water is in our oceans
The other 3% is fresh water but one third of that is ice like
glaciers
Taking the salt out of salt water is costly so humans
get most of our water from rivers and lakes
So to renew the fresh water there is a system called the water cycle and after humans use water for daily activities and other activities the water is then purified and used again

3. Water Shortages
Water shortages can be caused in many ways but the main way is drought
Drought is a period with less rainfall than normal in an area and then people have to limit there water use
Some places in the world don’t get any rain to support there water needs so people have to support themselves by finding water sources like in rivers or lakes

4. Water Pollution
Water Pollution is any change to water that is harmful to living things
Water Pollution can be caused by human activity for farming, construction, and mining which create pollutants and end up in water
Pollutants in the water spread quickly and effects areas far from the source
Some pollutants like copper or iron make water taste strange but harmful chemicals like mercury harm people and thing that drink and live in the water

5. Sewage and agricultural waste
Sewage is human wastes from toilets, sinks, and showers and if not treated properly, will mix with drinking water and poison people
Even treated water containing bacteria still in the water from treatment can multiply and use up oxygen in water killing fish and marine animals
Farms house animals and treats crops, but in the process, the animals produce waste and the crops are treated with chemicals, pesticides, and fertilizers
These pollutants get in to water and also harm land animals and cause many health issues and even birth effects
when in the water, the pollutants cause algae that covers the water’s surface blocking out light for plants in the water causing them to die

6. Industry and mining
Mills, chemical plants, and factories use metals that produce pollution that can pollute water
Mining also produce metal waste
If humans eat an animal exposed to the pollutant or drink polluted water, they get poisoned

7. Sediments and heat
When mud, silt, and sand flow through places, they pile on top of each other with materials from mines and factories the sediment eventually runs into a water source thus polluting it
Heat is used to boil water and is good, but sometimes if water from a factory that is used to cool things, the water is heated and when added back into water, changes the temperature and kills plants and marine life

8. Oil and Gasoline
Oil Spills take years to clean and kill many wildlife because of mistakes made when an oil ship’s storage tanks leaks
Gasoline leaks are also horrible. The storage tanks under a station or building leaks. Then the gasoline seeps into the soil and enters the groundwater and spreads
This causes a lot of problems in water and is hard to control because the sources are underground

9. The End