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Igneous or magmatic rocks The most primitive rock type forms when magma (molten rock) solidifies - either inside the earth (plutonic rocks) or during volcanic eruptions (volcanic rocks). A short overview.
Worst earthquakes of the 20th century More than 1.5 million people lost their lives because of earthquakes in the 20th century. Check the list of damaging and deadly quakes from 1900-1999!