A Mummy's DNA May Help Solve The Mystery Of The Origins Of Smallpox
The surprise find of smallpox DNA in a child mummy from the 17th century could help scientists start to trace the mysterious history of this notorious virus.
Smallpox currently only exists in secure freezers, after a global vaccination campaign eradicated the virus in the late 1970s. But much about this killer remains unknown, including its origins.
<span>c: The Earth's fluid core is the main source of magnetism, although not the only one.</span>
Earthquake mainly occur when there is rock movement along a crack on the crust of the earth. The slippage of the rocks causes shock waves that travel on the earth. A focus is a point on the earth where the actual movement takes place and an epicenter is a point which is directly above the focus. Seismographs are devices that record the earthquakes and do so by showing major waves patterns that is p-waves, s-waves and L-waves. Wave travel time from the epicenter to the seismic station can be estimated fro the travel charts.
In this case if the epicenter is 3200 km from the seismic station then the s-wave will take 11 mins 10 sec.
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An earthquake is the result of a sudden release of stored energy in the Earth's crust that creates seismic waves. Earthquakes may occur naturally or as a result of human activities. Smaller earthquakes can also be caused by volcanic activity, landslides, mine blasts, and nuclear experiments.
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