Toxic Sludge

 

What have Iron Oxide, Aluminium Oxide, Silicon Dioxide, Titanium Dioxide and Sodium Oxide all got in common?

Well, they were the substances found in the highest concentrations in the recent toxic sludge spill in Hungary.

What effect will they have?

It seems open to debate at ther moment but you can read more here:

http://www.bbc.co.uk/news/world-europe-11492387

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