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The diagram shows, in three column groupings, various divisions of Ear

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The diagram shows, in three column groupings, various divisions of Ear  [#permalink]

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New post Updated on: 12 Nov 2019, 09:50
Project IR Butler 2019-20 - Get one IR Question Everyday
Question # 43, Date : 12-Nov-2019
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The diagram shows, in three column groupings, various divisions of Earth's geological history since its formation approximately 4,600 million years ago. In the leftmost column grouping, the Precambrian eon is subdivided into chronometric eons shown on the far left; but otherwise, in the rest of the graphic, each subsequent column to the right shows the subdivisions of the timeframes to its left. Each of the rightmost two column groupings is a magnification—with additional information—of a portion of the grouping directly to its left.

Fill each blank using the drop-down menu to create the most accurate statement on the basis of the information provided.

1. The Miocene epoch spans closest to _______ of the era of which it is a part.

A. 3%
B. 25%
C. 85%

Spoiler: :: OA
B. 25%


2. According to the diagram the beginning of the _______ marks the onset of a new eon, era, and period in geological history.

A. Cambrian period
B. Triassic period
C. Pliocene epoch
D. Precambrian eon

Spoiler: :: OA
A. Cambrian period

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Originally posted by harikris on 18 Jul 2012, 07:22.
Last edited by SajjadAhmad on 12 Nov 2019, 09:50, edited 2 times in total.
Updated - Complete topic (70).
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Re: The diagram shows, in three column groupings, various divisions of Ear  [#permalink]

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New post 19 Jul 2012, 10:00
Ki karikris,

As is always the case with Graphics problems, we should read the text to help understand this image. Some questions can be answered without referencing the passage, but it's always easier to read first. And in this case, a single word--"magnification"--helps us understand the image. Those gray triangles marked off by dotted lines are telling us which part of the bar on the left is magnified by the bars moving right.

So, for the first question, the Miocene Epoch isn't in the same bar of the graph as any of the Eras. But looking at the magnification indicators, we can see that the entire rightmost graphic is expanded from the Cenozoic era. So, since the Miocene takes up about 25% of it's bar, it takes up about 25% of the Cenozoic Era of which it is part.

As for the second question, it asks for something about eons, eras, and periods--that puts us in graph 2. We're asking for the beginning of all three, which means we want a line straight across the graph. That's the Cambrian period, which starts the Phanerozoic Eon and the Paleozoic Era.

Good luck!
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Re: The diagram shows, in three column groupings, various divisions of Ear  [#permalink]

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New post 12 Nov 2019, 09:50
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Re: The diagram shows, in three column groupings, various divisions of Ear  [#permalink]

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New post 12 Nov 2019, 22:07
A) 25% per the third graph (Magnified version)

B) Cambrian period per the second graph ( Magnified version)

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Re: The diagram shows, in three column groupings, various divisions of Ear   [#permalink] 12 Nov 2019, 22:07
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