| Title | Comment | Keywords |
|---|---|---|
| Ocean Basalt | 13:04 - 13:49 (00:45) / 0.6 MB | ocean, ridge, "spreading center", magma, mantle, crystal, basalt, subduction, crust, volcano, "rim of fire", "J. Lawford Anderson" |
| Oceanic and Continental Magmas | 13:49 - 14:51 (01:02) / 1.0 MB | magma, "plate tectonics", "sea floor", iron, magnesium, basalt, "Bowen's Reaction Series", subduction, silica, andesite, "South America", ocean, ridge, "Dee Trent" |