provide evidence of past life, and thus help geologists understand how life, and the environments changed throughout Earth's history.

Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
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provide evidence of past life, and thus help geologists understand how life,
and the environments changed throughout Earth's history.
Fossils
Igneous rocks
Faults
Strata
Transcribed Image Text:provide evidence of past life, and thus help geologists understand how life, and the environments changed throughout Earth's history. Fossils Igneous rocks Faults Strata
Which of the following statements about the banded iron formations is true?
The BIFs show evidence of an oxygen-rich atmosphere that forced the oceans to
become oxidizing and precipitate iron-oxide minerals. They are abundant at the
beginning of the Proterozoic Eon.
The BIFs show evidence of an oxygen-poor ocean because all the oxygen was
trapped in the iron-oxide minerals that make up the formation.
The BIFs show evidence of a salt-free ocean that forced iron to bond with the
oxygen in the water to form iron-oxide minerals.
The BIFs show evidence of an oxygen-poor atmosphere because all of the
oxygen was dissolved into the oceans and then precipitated as iron-oxide
minerals.
Transcribed Image Text:Which of the following statements about the banded iron formations is true? The BIFs show evidence of an oxygen-rich atmosphere that forced the oceans to become oxidizing and precipitate iron-oxide minerals. They are abundant at the beginning of the Proterozoic Eon. The BIFs show evidence of an oxygen-poor ocean because all the oxygen was trapped in the iron-oxide minerals that make up the formation. The BIFs show evidence of a salt-free ocean that forced iron to bond with the oxygen in the water to form iron-oxide minerals. The BIFs show evidence of an oxygen-poor atmosphere because all of the oxygen was dissolved into the oceans and then precipitated as iron-oxide minerals.
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