Question

State three facts in support of the existence of Earth’s magnetic field​

Answer 1

Explanation:

:)Deep within Earth, swirling liquid iron generates our planet's protective magnetic field. This magnetic field is invisible but is vital for life on Earth's surface: it shields the planet from harmful solar wind and cosmic rays from the sun.

• New research from the University of Rochester provides evidence that the magnetic field that first formed around Earth was even stronger than scientists previously believed. The research, published in the journal PNAS, will help scientists draw conclusions about the sustainability of Earth's magnetic shield and whether or not there are other planets in the solar system with the conditions necessary to harbor life.

• Today's magnetic shield is generated in Earth's outer core. The intense heat in Earth's dense inner core causes the outer core -- composed of liquid iron -- to swirl and churn, generating electric currents, and driving a phenomenon called the geodynamo, which powers Earth's magnetic field. The currents in the liquid outer core are strongly affected by the heat that flows out of the solid inner core.

• Because of the location and extreme temperatures of materials in the core, scientists aren't able to directly measure the magnetic field. Fortunately, minerals that rise to Earth's surface contain tiny magnetic particles that lock in the direction and intensity of the magnetic field at the time the minerals cool from their molten state.

• Using new paleomagnetic, electron microscope, geochemical, and paleointensity data, the researchers dated and analyzed zircon crystals -- the oldest known terrestrial materials -- collected from sites in Australia. The zircons, which are about two-tenths of a millimeter, contain even smaller magnetic particles that lock in the magnetization of the earth at the time the zircons were formed.