Video shows the moment a powerful explosion rocked Nicaragua's Telica volcano, as onlookers stood just metres away from the crater
Wednesday 13 May 2015
Volcano erupts in dramatic fashion as people stand nearby
Inge Lehmann: the woman who discovered the Earth's inner core
While comparing data on the event Lehmann noticed that some seismic waves were bouncing off a boundary within the earth's core and being detected in the shadow zone.
Her work put forward that this seismic discontinuity was due to an inner core made of different material. Her findings were quickly accepted by the scientific community.
Previously scientists thought that the Earth was comprised of a single molten sphere rather than both inner and outer cores.
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