HSC Earth And Environmental Science Practice Questions - HSC Earth And Environmental Science (NSW Higher School Certificate, Year 12) Exam

Banded Iron Formations (BIFs) deposited between 3.8 and 1.8 billion years ago provide geological evidence for:

The reaction of dissolved ocean iron with free oxygen produced by photosynthetic organisms The sudden cooling of Earth's outer core Widespread meteoritic impacts during the Hadean Eon The rapid melting of global ice sheets during the Cryogenian

Correct Answer:

The reaction of dissolved ocean iron with free oxygen produced by photosynthetic organisms

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