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An introduction to geology
An introduction to geology

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Further reading

If you are interested in finding out more about Oldoinyo Lengai, YouTube has some fascinating videos showing the low viscosity carbonatite lava erupting: Oldoinyo Lengai [Tip: hold Ctrl and click a link to open it in a new tab. (Hide tip)]
For an even more detailed insight into REES, visit the British Geological Surveys website: British Geological Surveys - rare earth elements