Constant motion in the surrounding liquid iron outer core is believed to contribute to the slowdown of the solid inner core, along with gravitational forces in the overlying mantle.The rotation of Earth's inner core began to slow down more than a decade ago, altering the length of our days by fractions of a second. and nuclear tests, both of which send vibrations through the planet.
"The inner core had slowed down for the first time in many decades," John Vidale, co-author of the study and a professor of Earth Sciences at USC, said in the statement."Other scientists have recently argued for similar and different models, but our latest study provides the most convincing resolution."is a hot, dense and solid ball made of iron and nickel, located 3,200 miles below our feet.
In theory, repeating earthquakes would produce identical seismograms because they occur in the same location. That's why comparing the seismic data from different points incan reveal changes beneath the planet's surface. Subtle changes in how long it took for the seismic waves to travel through theat different times in the planet's history revealed the inner core’s slowdown.
When not writing or reading about science, Samantha enjoys traveling to new places and taking photos! You can follow her on Twitter @Sam_Ashley13.
Source: Education Headlines (educationheadlines.net)
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