C14-Earths Resources
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What is sea water?
Water in the seas and oceans
What is ground water?
Water in underground streams, rocks, and aquifiers
What is fresh water?
Water in underground streams and rocks, rivers, lakes, ice caps, and glaciers
What is waste water?
Used water from homes, industry, and agriculture
What is Potable water?
Water that is fit to drink
What is pure water?
Water that is 100% pure and contains nothing else
What are the levels of microbes in Sea water?
High levels
What are the levels of dissolved substances in Sea water?
High
What are the levels of microbes in ground water?
Low
What are the levels of microbes in ground water?
Low
What are the levels of microbes in fresh water?
Low
What are the levels of dissolves substances in fresh water?
Low
What are the levels of microbes in waste water?
High
What are the levels of dissolved substances in waste water?
High
What are the levels of microbes in potable water?
None or low
What are the levels of dissolved substances in potable water?
Low
What are the levels of microbes in pure water?
Nonw
What are the levels of dissolved substances in pure water?
Nonw
How do you make potable water from fresh water?
1) Filtration 2) Sterilisation
What is filtration and what does it do when making potable water from fresh water?
*Filtration is done by passing water through a wire mesh screen then filter beds (usually sand) *This removes solids
What is sterilisation and what does it do when making potable water from fresh water?
*Sterilisation is done by adding chlorine, treating with ozone, or using UV light *This kills microbes in the water
What process makes potable water from sea water?
Desalination
What are the 2 desalination methods?
Distillation * Reverse Osmosis
How does reverse osmosis work?
Salt water is put through a partially-permeable membrane, which only allows water molecules to pass through. This happens as the membrane stops larger molecules and ions passing through