Snowball Earth & Ancient Geology Quiz

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Questions and Answers

What is the main reason for the disappearance of Banded Iron Formations (BIFs) from the rock record at around 1.9 Ga?

  • Massive cap carbonates covered the BIFs
  • The alternation between oxic and anoxic ocean waters ceased (correct)
  • The inclination angle of the BIFs changed
  • The BIFs were affected by dropstones

What does natural remnant magnetism (NRM) of a rock or sediment preserve?

  • Paleo latitude at the time of formation (correct)
  • The presence of cap carbonates
  • The inclination angle of the Earth
  • Climate conditions at the time of formation

How can one determine if the magnetism of a rock has been reset?

  • Check for the presence of cap carbonates
  • Examine magnetism in folded rock layers (correct)
  • Measure the presence of dropstones
  • Analyze the inclination angle of the rock

What does the presence of dropstones indicate about a region's latitude?

<p>It confirms the region was located well within 60 degrees of the equator (A)</p> Signup and view all the answers

How could warm water carbonates form directly on top of glacial deposits?

<p>The cap carbonates resulted from non-biologically mediated carbonate precipitation (A)</p> Signup and view all the answers

Why were the oceans swinging between oxic and anoxic?

<p>Due to changes in ocean productivity (B)</p> Signup and view all the answers

What caused the axial tilt during the Neo Proterozoic?

<p>The Big Tilt Hypothesis proposes a major collision (C)</p> Signup and view all the answers

How can warm water deposits overlie glacial deposits?

<p>Cap carbonates are isotopically light (C)</p> Signup and view all the answers

What caused the axial 'un-tilt'?

<p>The Big Tilt Hypothesis does not address this (C)</p> Signup and view all the answers

How could ice form at the equator?

<p>Due to Earth's substantial axial tilt during the Neo Proterozoic (A)</p> Signup and view all the answers

Why was ocean productivity reduced?

<p>Due to the swinging between oxic and anoxic oceans (B)</p> Signup and view all the answers

What about banded iron formations, cap carbonates, and light carbon isotopes?

<p>They are related to the environmental conditions during the Neo Proterozoic (B)</p> Signup and view all the answers

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"Snowball Earth (Part 2)" PDF

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