The fourth Seminar is the series is on the second of the three rock groups; Igneous Rocks. I look at the different types of igneous rocks, how they can form from the other two rock groups, how geologists classify them and common examples.
What has happened to Seminar 3, you ask? Problem with the recording file I'm afraid which will need sorting out or re-recording.
Seminar 5 links nicely to No. 4, being on Volcanoes and is the last recording files I have "on the stocks".
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