Isua Supracrustal Belt rocks in West Greenland, dating back 3.7 billion years, display a marbled appearance due to banded iron formations (BIF) formed at a temperature of 550°C, aligning with Earth's magnetic field.
Earth's magnetic field crucially shields against cosmic-ray bombardments and prevents atmospheric loss, indicating its vital role in maintaining a habitable climate and liquid water on early Earth.
#isua-supracrustal-belt-rocks #earths-magnetic-field #banded-iron-formations #magnetosphere #geological-history
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