QS 1: Banded iron formations (BIFs) show evidence of an oxygen-rich atmosphere t
ID: 299816 • Letter: Q
Question
QS 1: Banded iron formations (BIFs) show evidence of an
oxygen-rich atmosphere that forced the oceans to become oxidizing and precipitate iron-oxide minerals.
oxygen-poor ocean because all the oxygen was trapped in the iron-oxide minerals that make up the formation.
acidic ocean that forced iron to bond with the oxygen in the water to form iron-oxide minerals.
oxygen-poor atmosphere because all of the oxygen was dissolved into the oceans and then precipitated as iron-oxide minerals.
QS 2 :
Why did banded iron formations form between 2.4 and 1.8 Ga?
A mass extinction released iron into the oceans.
The oceans began to absorb large amounts of oxygen.
Cyanobacteria stopped using them as nutrients.
The oceans became oversaturated in iron.
QS 3:
Where would you be most likely to see a piece of the earliest continental crust?
southern California
central Canada
the ocean floor
Iceland
QS 4:
It took so long for true crust to form on Earth because
temperatures were so high that any crust that did form was quickly remelted.
there was no atmosphere on the planet and thus no air to cool the crust.
heat from the creation of the magnetic field kept the surface molten.
Earth had to complete the differentiation process before rocks could form.
QS 5:
Some researchers have suggested the use of the term __________ to denote the most recent part of the geologic record, which has been characterized by rapid changes in the atmosphere, landscape, and biodiversity as a result of human actions.
Neogene
Homosapian
Anthropocene
Holocene
QS:6
The evolution of shells was important for the diversification of life because shells
provide a habitat for organisms and protect them from sunlight.
provide a food source for organisms higher on the food chain.
provide protection from the highly acidic ocean water of the time.
protect organisms from predators and environmental conditions.
a.oxygen-rich atmosphere that forced the oceans to become oxidizing and precipitate iron-oxide minerals.
b.oxygen-poor ocean because all the oxygen was trapped in the iron-oxide minerals that make up the formation.
c.acidic ocean that forced iron to bond with the oxygen in the water to form iron-oxide minerals.
d.oxygen-poor atmosphere because all of the oxygen was dissolved into the oceans and then precipitated as iron-oxide minerals.
Explanation / Answer
QS1-d
QS2-b
QS3-b (Acasta Gneiss is the rock)
QS4-a
QS5-d
QS6-d (due to its hardness it is safe from predators and many unfavourable environmental conditions like acidic, high temperature and pressure etc)
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