A well is made out of concrete. This is called the digester tank T. It is divided into two parts. One side has the inlet, from where slurry is fed to the tank.
You can make ozone test strips to detect and monitor ozone levels in your own backyard or around your school.
Photovoltaic
The solar energy that reaches the earth in about an hour is equal to the annual amount of commercial energy consumed by human beings.
It is estimated that in 2020 Solar electricity can provide electricity to over 1 billion people worldwide. It could also provide more than 2 million jobs in production, installation and maintenance. ...
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Biofuels: How Bio Gas Is Generated 
