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# A tree s age can be determined by counting the annual growth

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A tree s age can be determined by counting the annual growth [#permalink]  24 Feb 2008, 08:29
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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 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.
(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 artifacts that can be dated to roughly 2300 years ago.

Pls explain
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Re: CR: Pazyryk Valley [#permalink]  25 Feb 2008, 06:49
(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 artifacts. -> Irrelevant info- tombs artifacts,Eliminate it

(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.-> Irrelevant, we are not concerned about the uniqueness of PV trees annual rings

(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.-> Using the # of rings of given pattern the relative age of tomb could be found, hold it

(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. ->You know the youngest and oldest but you don't know how to find the others- no relative age information, eliminate it

(E) All of the Pazyryk tombs contained cultural artifacts that can be dated to roughly 2300 years ago.-> irrelevant info-> cultural artifacts, Eliminate it

Ans -C
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Re: CR: Pazyryk Valley [#permalink]  02 Mar 2008, 16:29
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 artifacts.-----Not Relevant ....not providing any iformation regarding calculating the age of the tomb-eliminate
(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 provides an explanation in calculating the age of the tomb --Hold it
(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.--Odesnot provide explanation in calculating the age of the tomb --Eliminate

(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.--Eliminate..not relevant
(E) All of the Pazyryk tombs contained cultural artifacts that can be dated to roughly 2300 years ago.--Eliminate..is not providing any explanation regarding the calculation of the age of the tomb

Like to go for "B"

prasannar wrote:
(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 artifacts. -> Irrelevant info- tombs artifacts,Eliminate it

(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.-> Irrelevant, we are not concerned about the uniqueness of PV trees annual rings

(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.-> Using the # of rings of given pattern the relative age of tomb could be found, hold it

(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. ->You know the youngest and oldest but you don't know how to find the others- no relative age information, eliminate it

(E) All of the Pazyryk tombs contained cultural artifacts that can be dated to roughly 2300 years ago.-> irrelevant info-> cultural artifacts, Eliminate it

Ans -C
regards,
Pras
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Re: CR: Pazyryk Valley [#permalink]  04 Mar 2008, 04:38
I'll go for C. What is the OA?
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Re: CR: Pazyryk Valley [#permalink]  15 May 2010, 06:07
could anybody explain this one?
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Re: CR: Pazyryk Valley [#permalink]  30 Jun 2010, 17:45
I didn't get this one.
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Re: CR: Pazyryk Valley [#permalink]  01 Jul 2010, 01:00
If I had to say something, I would say B...
OA is C. Could anybody elaborate on this, please??
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Re: CR: Pazyryk Valley [#permalink]  01 Jul 2010, 08:41
(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 artifacts.
we are not concerned with tombs artifacts but with dating the site using the annual ring pattern in trees
(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.
again irrelevant because we want to focus on dating the site not on comparing trees of Paz with those of 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.
this clearly shows how the two features - viz annual rings and pattern of rainfall can be used to date the site.
(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.
knowing the age of youngest and oldest trees does not tell us HOW the site was dated.(E) All of the Pazyryk tombs contained cultural artifacts that can be dated to roughly 2300 years ago.
knowing the age of cultural artifacts does not tell us HOW the site was dated.
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Re: CR: Pazyryk Valley [#permalink]  04 Jul 2010, 13:32
B cannot be used to determine the age of tombs because only the size of rings is related to the amount of rainfall. And the size of rings cannot be used to determine age. Rather we need the number of rings (because 1 ring is equal to 1 year as stated in the premise) along with the amount of rainfall to determine the number of years.

Hence C.
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Re: CR: Pazyryk Valley [#permalink]  04 Jul 2010, 14:02
For me C. A & E are out of scope - no mention of the trees. D is out of scope - the statement did not relate the trees' connection with the valley. B says the trees were subjected to yearly pattern - giving us nothing to distinguish one ring to the next. C establishes a unique pattern that the scientists can use. Find a time in history that matches the pattern of the logs - voila, mystery solved.
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Re: CR: Pazyryk Valley [#permalink]  05 Jul 2010, 23:35
In order to date the tombs relatively to each other, you need to find a common date to start from. If you don't, you only know that for example a tree used for a tomb was 90 years old, while a tree used for another tomb was 120 years old.
This common date from which you can date tombs is provided by the specific pattern mentioned by answer C.
All other answers do not provide any info on how to relate a tree's age to another tree's age.
Thus C.
Re: CR: Pazyryk Valley   [#permalink] 05 Jul 2010, 23:35
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