The series finale travels to the Tonga archipelago in the South Pacific, where tectonic movements can construct or swallow islands. Included: how the sooty tern and Alvin shrimp have adapted to life around such ephemeral lands.
The life that surrounds Nicaragua's active Masaya Volcano is examined. Included: bats that have colonized the miles of tunnels created by hot flowing magma; and parakeets and vultures that have made nests inside the crater. Also: vegetation that, over hundreds of years, has recolonized barren stretches on the volcano's flanks; and the fields, pastures and towns that have grown over the oldest lava flows.
The series about volcanoes begins with a survey of Icelandic volcanoes in an attempt to gauge whether any will erupt in the near future and, if so, what the consequences might be. The relatively mild eruption of Iceland's Eyjafjallajökull volcano in 2010 halted air travel in Europe for several days. Here, experts ponder the damage and disruptions that a major eruption could bring.