12 Questions
What is the main reason for the disappearance of Banded Iron Formations (BIFs) from the rock record at around 1.9 Ga?
The alternation between oxic and anoxic ocean waters ceased
What does natural remnant magnetism (NRM) of a rock or sediment preserve?
Paleo latitude at the time of formation
How can one determine if the magnetism of a rock has been reset?
Examine magnetism in folded rock layers
What does the presence of dropstones indicate about a region's latitude?
It confirms the region was located well within 60 degrees of the equator
How could warm water carbonates form directly on top of glacial deposits?
The cap carbonates resulted from non-biologically mediated carbonate precipitation
Why were the oceans swinging between oxic and anoxic?
Due to changes in ocean productivity
What caused the axial tilt during the Neo Proterozoic?
The Big Tilt Hypothesis proposes a major collision
How can warm water deposits overlie glacial deposits?
Cap carbonates are isotopically light
What caused the axial 'un-tilt'?
The Big Tilt Hypothesis does not address this
How could ice form at the equator?
Due to Earth's substantial axial tilt during the Neo Proterozoic
Why was ocean productivity reduced?
Due to the swinging between oxic and anoxic oceans
What about banded iron formations, cap carbonates, and light carbon isotopes?
They are related to the environmental conditions during the Neo Proterozoic
Test your knowledge of Earth's history with this quiz on the "Snowball Earth Period" and geological events such as the Neo Proterozoic, Proterozoic, and Paleo Proterozoic eras. Explore topics like the Huronian Glaciation, Archean climate, and the formation of Banded Iron Formations. Perfect for geology enthusiasts and students of Earth's ancient past.
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