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A tree's age can be determined by counting the annual growth rings in its trunk. Each ring represents one year, and the ring's thickness reveals the relative amount of rainfall that year. Archaeologists successfully used annual rings to determine the relative ages of ancient tombs at Pazyryk. Each tomb was constructed from freshly cut logs, and the tombs builders were constrained by tradition to use only logs from trees growing in the sacred Pazyryk Valley.

Which one of the following, if true, contributes most to an explanation of the archaeologists' success in using annual rings to establish the relative ages of the tombs at the Pazyryk site?

(A) The Pazyryk tombs were all robbed during ancient times, but breakage of the tombs seals allowed the seepage of water, which soon froze permanently, thereby preserving the tombs' remaining artefacts.

(B) The Pazyryk Valley, surrounded by extremely high mountains, has a distinctive yearly pattern of rainfall, and so trees growing in the Pazyryk Valley have annual rings that are quite distinct from trees growing in nearby valleys.

(C) Each log in the Pazyryk tombs has among its rings a distinctive sequence of twelve annual rings representing six drought years followed by three rainy years and three more drought years.

(D) The archaeologists determined that the youngest tree used in any of the tombs was 90 years old and that the oldest tree was 450 years old.

(E) All of the Pazyryk tombs contained cultural artefacts that can be dated to roughly 2300 years ago.

Re: A tree's age can be determined by counting the [#permalink]

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05 Apr 2015, 11:18

A tree's age can be determined by counting the annual growth rings in its trunk. Each ring represents one year, and the ring's thickness reveals the relative amount of rainfall that year. Archaeologists successfully used annual rings to determine the relative ages of ancient tombs at Pazyryk. Each tomb was constructed from freshly cut logs, and the tombs builders were constrained by tradition to use only logs from trees growing in the sacred Pazyryk Valley.

Which one of the following, if true, contributes most to an explanation of the archaeologists' success in using annual rings to establish the relative ages of the tombs at the Pazyryk site?

(A) The Pazyryk tombs were all robbed during ancient times, but breakage of the tombs seals allowed the seepage of water, which soon froze permanently, thereby preserving the tombs' remaining artefacts --- too far off the point. question says nothing about preservation of artifacts

(B) The Pazyryk Valley, surrounded by extremely high mountains, has a distinctive yearly pattern of rainfall, and so trees growing in the Pazyryk Valley have annual rings that are quite distinct from trees growing in nearby valleys --- it only compares rings characteristics, not sufficient

(C) Each log in the Pazyryk tombs has among its rings a distinctive sequence of twelve annual rings representing six drought years followed by three rainy years and three more drought years --- distinguishing between rainy ring and drought rings is enough to calculate the logs age

(D) The archaeologists determined that the youngest tree used in any of the tombs was 90 years old and that the oldest tree was 450 years old --- not sufficient

(E) All of the Pazyryk tombs contained cultural artefacts that can be dated to roughly 2300 years ago --- irrelevant

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22 May 2015, 01:42

Question is very difficult ,atleast i felt so . I marked C because thought others are not much relevant and C spoke something about years etc.
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28 Jun 2015, 11:15

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souvik101990 wrote:

A tree's age can be determined by counting the annual growth rings in its trunk. Each ring represents one year, and the ring's thickness reveals the relative amount of rainfall that year. Archaeologists successfully used annual rings to determine the relative ages of ancient tombs at Pazyryk. Each tomb was constructed from freshly cut logs, and the tombs builders were constrained by tradition to use only logs from trees growing in the sacred Pazyryk Valley.

Which one of the following, if true, contributes most to an explanation of the archaeologists' success in using annual rings to establish the relative ages of the tombs at the Pazyryk site?

(A) The Pazyryk tombs were all robbed during ancient times, but breakage of the tombs seals allowed the seepage of water, which soon froze permanently, thereby preserving the tombs' remaining artefacts.

(B) The Pazyryk Valley, surrounded by extremely high mountains, has a distinctive yearly pattern of rainfall, and so trees growing in the Pazyryk Valley have annual rings that are quite distinct from trees growing in nearby valleys.

(C) Each log in the Pazyryk tombs has among its rings a distinctive sequence of twelve annual rings representing six drought years followed by three rainy years and three more drought years.

(D) The archaeologists determined that the youngest tree used in any of the tombs was 90 years old and that the oldest tree was 450 years old.

(E) All of the Pazyryk tombs contained cultural artefacts that can be dated to roughly 2300 years ago.

Question asks not about ages of tombs or logs but about relative ages of tombs.

So scientists need to know that this tomb (number 1) was build firstly and this tomb 3 year after the first tomb and so on. They need only order of ages of buildings.

If we have sequence of rainy and drought years: 6D-3R-3D when we can analyze tombs in such way: tomb #1 - its logs has 10 drought years - this is oldest tomb, tomb #2 - its logs has 10 drought years + 3 rainy years - this tomb is younger than tomb#1, tomb #3 - its logs has 10 drought years + 3 rainy years + 2 drought - this tomb is younger than tomb#2 and so on.

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08 Jul 2015, 14:26

B seemed to be initial choice for me But was not fully convinced with C ,until read the question again Which one of the following, if true, contributes most to an explanation of the archaeologists' success in using annual rings to establish the relative ages of the tombs at the Pazyryk site?

Re: A tree's age can be determined by counting the [#permalink]

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12 Aug 2015, 08:54

Harley1980 wrote:

souvik101990 wrote:

A tree's age can be determined by counting the annual growth rings in its trunk. Each ring represents one year, and the ring's thickness reveals the relative amount of rainfall that year. Archaeologists successfully used annual rings to determine the relative ages of ancient tombs at Pazyryk. Each tomb was constructed from freshly cut logs, and the tombs builders were constrained by tradition to use only logs from trees growing in the sacred Pazyryk Valley.

Which one of the following, if true, contributes most to an explanation of the archaeologists' success in using annual rings to establish the relative ages of the tombs at the Pazyryk site?

(A) The Pazyryk tombs were all robbed during ancient times, but breakage of the tombs seals allowed the seepage of water, which soon froze permanently, thereby preserving the tombs' remaining artefacts.

(B) The Pazyryk Valley, surrounded by extremely high mountains, has a distinctive yearly pattern of rainfall, and so trees growing in the Pazyryk Valley have annual rings that are quite distinct from trees growing in nearby valleys.

(C) Each log in the Pazyryk tombs has among its rings a distinctive sequence of twelve annual rings representing six drought years followed by three rainy years and three more drought years.

(D) The archaeologists determined that the youngest tree used in any of the tombs was 90 years old and that the oldest tree was 450 years old.

(E) All of the Pazyryk tombs contained cultural artefacts that can be dated to roughly 2300 years ago.

Question asks not about ages of tombs or logs but about relative ages of tombs.

So scientists need to know that this tomb (number 1) was build firstly and this tomb 3 year after the first tomb and so on. They need only order of ages of buildings.

If we have sequence of rainy and drought years: 6D-3R-3D when we can analyze tombs in such way: tomb #1 - its logs has 10 drought years - this is oldest tomb, tomb #2 - its logs has 10 drought years + 3 rainy years - this tomb is younger than tomb#1, tomb #3 - its logs has 10 drought years + 3 rainy years + 2 drought - this tomb is younger than tomb#2 and so on.

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12 Aug 2015, 09:52

I marked it B, but now i realize its C I think what kanigmat011 mentioned "the relative age of Tombs" in the question is the catch here to go for option C.

Re: A tree's age can be determined by counting the [#permalink]

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12 Aug 2015, 11:27

rohit8865 wrote:

Harley1980 wrote:

souvik101990 wrote:

A tree's age can be determined by counting the annual growth rings in its trunk. Each ring represents one year, and the ring's thickness reveals the relative amount of rainfall that year. Archaeologists successfully used annual rings to determine the relative ages of ancient tombs at Pazyryk. Each tomb was constructed from freshly cut logs, and the tombs builders were constrained by tradition to use only logs from trees growing in the sacred Pazyryk Valley.

Which one of the following, if true, contributes most to an explanation of the archaeologists' success in using annual rings to establish the relative ages of the tombs at the Pazyryk site?

(A) The Pazyryk tombs were all robbed during ancient times, but breakage of the tombs seals allowed the seepage of water, which soon froze permanently, thereby preserving the tombs' remaining artefacts.

(B) The Pazyryk Valley, surrounded by extremely high mountains, has a distinctive yearly pattern of rainfall, and so trees growing in the Pazyryk Valley have annual rings that are quite distinct from trees growing in nearby valleys.

(C) Each log in the Pazyryk tombs has among its rings a distinctive sequence of twelve annual rings representing six drought years followed by three rainy years and three more drought years.

(D) The archaeologists determined that the youngest tree used in any of the tombs was 90 years old and that the oldest tree was 450 years old.

(E) All of the Pazyryk tombs contained cultural artefacts that can be dated to roughly 2300 years ago.

Question asks not about ages of tombs or logs but about relative ages of tombs.

So scientists need to know that this tomb (number 1) was build firstly and this tomb 3 year after the first tomb and so on. They need only order of ages of buildings.

If we have sequence of rainy and drought years: 6D-3R-3D when we can analyze tombs in such way: tomb #1 - its logs has 10 drought years - this is oldest tomb, tomb #2 - its logs has 10 drought years + 3 rainy years - this tomb is younger than tomb#1, tomb #3 - its logs has 10 drought years + 3 rainy years + 2 drought - this tomb is younger than tomb#2 and so on.

So answer is C.

Not understand ur concept...Please elaborate....

Hello rohit8865 Could you please specify which moments exactly you did not understand?
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28 Sep 2017, 03:51

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24 Oct 2017, 08:10

6 droughts, followed by 3 Rains and 3 droughts. Oldest will have as many number of continuous droughts. If a log X has 7 drought ones, whereas on the other hand a second one Y has 7 droughts and 2 rainy ones. It will imply the first one is older than the second. A third Z with 7 droughts 2 rain and 2 droughts will still be younger than the first because the first probably did not survive after the 7 droughts. So, the final order is X>Y>Z. Answer- option C.

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