20 of 20: A film crew working for National Geographic publication set-up on southern Iceland's Eyjafjallajokull glacier after landing on the glacier, close to the volcanic eruption, on Sunday April 18, 2010. Scientists say that because the volcano is situated below the glacial ice cap, magma is being cooled quickly, causing explosions and plumes of grit. The eruption is ongoing and forecasters have predicted that light prevailing winds in Europe mean that the situation for air travel is unlikely to change in the coming days. (AP Photo)

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