Answer
• Improving the environmental performances
• Developing Green Mining technology
Explanation
The effect to the environment caused by opal mining are; impact on soils and geology, clearing of native vegetation disrupting flora and fauna, change in land use and effects of air quality.
Opal mining is currently examining environmental impacts and adopting measures that mitigate the impacts making the process less destructive to the environment.
With the current commitment to sustainability, opal companies are investing funds for Green Mining as a positive way to impact the environment before and after mining.
Max: 152 million km
min 146 million km
Answer:
Explanation:
Given
Electrostatic force between two electrons is equal to weight of one electron
i.e.
where 
are the charge of particles
mass of electron
r=distance between them
