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As a result of radioactive heating over millions of years, Earth’s molten core is probably fairly hot today, around 11,000°F. By comparison, lead melts at around 800°F. Most of Earth’s 2,100-mile-thick core is liquid, but the center of the core is mostly solid iron. The liquid outer portion, about 95% of the core, is constantly in motion. The interaction between the solid inner core and the fluid outer core creates a hydromagnetic dynamo that generates the magnetic field around Earth. The magnetic field protects Earth from harmful cosmic radiation and makes navigation by compass possible. Scientists have observed a 10% decline in the dipolar magnetic field over the last 150 years. There is a point off the coast of Brazil where the field is 30% weaker, causing glitches in satellites and spacecraft flying through it. This weakening of the magnetic field has scientists speculating that it may eventually collapse in about 1,500–2,000 years and lead to a reversal of the South and North Poles. Polar reversals are a periodic occurrence.

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TrendingHere are the facts and trivia that people are buzzing about.

Did Birds Evolve from Dinosaurs?

The Twelve Dancing Princesses

Current Events This Week: January 2023

African Americans by the Numbers

Andersen’s Fairy Tales: Contents

The Celtic Twilight: A Teller of Tales

TrendingHere are the facts and trivia that people are buzzing about.

Did Birds Evolve from Dinosaurs?

The Twelve Dancing Princesses

Current Events This Week: January 2023

African Americans by the Numbers

Andersen’s Fairy Tales: Contents

The Celtic Twilight: A Teller of Tales

  • Did Birds Evolve from Dinosaurs?
  • The Twelve Dancing Princesses
  • Current Events This Week: January 2023
  • African Americans by the Numbers
  • Andersen’s Fairy Tales: Contents
  • The Celtic Twilight: A Teller of Tales