Microscopic plants, using volcanic ash for dating
25 April 2012
Presented byRichard Hollingham,Sue Nelson.
This week in the Planet Earth Podcast - we take a closer look at tiny marine plants, which underpin the entire marine food chain and play a vital role in the Earth's climate. Also, how scientists are using volcanic ash called tefra to tell how people may have responded to rapid environmental changes in the recent past.
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