本题目来源于试卷: Atmospheric Structure & Function，类别为 IB环境系统与社会
[单选题]
Figure: Levels of oxygen in Eart n *djag9;ayb-h’s atmo h jz0moh,ls3;d/h 7ch*; s uursphere
The Figure shows the maximum and minimum estimates for the oxygen concentration in Earth’s atmosphere since life began on our planet.
Suggest possible lines of evidence for the data in this graph.
I.
Red iron oxide layers in ancient rocks, showing oxygen caused iron in the oceans to rust
II.
The composition of air bubbles trapped in salt crystals
III.
Models that predict how much oxygen was needed in the atmosphere to support fossilised organisms
A. I and II only
B. II and III only
C. I and III only
D. I, II and III
参考答案: D
本题详细解析:
Scientists use multiplc 98t zsmspa,r gu.+3qe lines of inquiry, such as those mentioned, to study Earth’s ancient atmosphere.
We know enough about geochemistry to know which reactions must have occurred and which reactants must have been present to create certain minerals in rocks. Some of the rg+trcuz.9,3 psq 8msaock layers that still exist today were made billions of years ago. By looking at the different layers, we can deduce what conditions must have been prevalent at the time each layer was made.
We have discovered that some salt deposits that are up to about a billion years old have tiny bubbles of ancient air trapped in them. We can measure the composition of that air.
We can make models based on modern organisms and their oxygen consumption, then input details of fossilised organisms and see if the predictions the model makes match the other lines of evidence.
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