Science

Giant ‘Lava Lamp’ Inside Earth May Cause Magnetic Poles to Flip


Regions just above Earth's core, in the mantle layer, could behave like huge lava lamps, says one expert. There, blobs of the molten rock would periodically rise and fall, a phenomenon that could affect the planet's magnetic field. Credit: Vadim Sadovski/Shutterstock
Want create site? Find Free WordPress Themes and plugins.

If you could travel back in time 41,000 years to the last ice age, your compass would point south instead of north. That’s because for a period of a few hundred years, the Earth’s magnetic field was reversed.

These reversals have happpened repeatedly over the planet’s history, sometimes lasting hundreds of thousands of years. We know this from the way it affects the formation of magnetic minerals, that we can now study on the Earth’s surface.

Several ideas exist to explain why magnetic field reversals happen. One of these just became more plausible. My colleagues and I discovered that regions on top of the Earth’s core could behave like giant lava lamps, with blobs of rock periodically rising and falling deep inside our planet.

This could affect its magnetic field and cause it to flip. The way we made this discovery was by studying signals from some of the world’s most destructive earthquakes.

Around 3,000km below our feet – 270 times further down than the deepest part of the ocean – is the start of the Earth’s core, a liquid sphere of mostly molten iron and nickel.

Prev1 of 4

Did you find apk for android? You can find new Free Android Games and apps.
Click to comment

The Latest

The Latest Post

Last Post

More Posts

The Latest

COPYRIGHT © 2016 TECH NEWS. POWERED BY TRENDMEDIA-ID

To Top