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# Most of the ultraviolet radiation reaching the Earths atmosphere from

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Senior Manager
Joined: 02 Jan 2017
Posts: 307

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Updated on: 03 Oct 2017, 22:16
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83% (01:29) correct 17% (02:07) wrong based on 157 sessions

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Most of the ultraviolet radiation reaching the Earths atmosphere from the Sun is absorbed by the layer of stratospheric ozone and never reaches the Earths surface. Between 1969 and 1986, the layer of stratospheric ozone over North America thinned, decreasing by about 3 percent. Yet the average level of ultraviolet radiation measured at research stations across North America decreased over the same period.

Which one of the following, if true, best reconciles the apparently discrepant facts described above?

(A) Ultraviolet radiation increases the risk of skin cancer and cataracts; the incidence of skin cancer and cataracts increased substantially between 1969 and 1986.

(B) Between 1969 and 1986, the layer of stratospheric ozone over Brazil thinned, and the average level of ultraviolet radiation reaching the Earths surface in Brazil increased.

(C) Manufactured chlorine chemicals thin the layer of stratospheric ozone.

(D) Ozone pollution, which absorbs ultraviolet radiation, increased dramatically between 1969 and 1986.

(E) Thinning of the layer of stratospheric ozone varies from one part of the world to another and from year to year.

Source: LSAT

Originally posted by vikasp99 on 05 Mar 2017, 05:50.
Last edited by broall on 03 Oct 2017, 22:16, edited 1 time in total.
Reformatted question
Current Student
Joined: 23 Jul 2015
Posts: 152
Re: Most of the ultraviolet radiation reaching the Earths atmosphere from  [#permalink]

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05 Mar 2017, 09:14
should be D. Only this choice reconciles the surprising findings.
Intern
Joined: 01 Feb 2017
Posts: 18
Re: Most of the ultraviolet radiation reaching the Earths atmosphere from  [#permalink]

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07 Mar 2017, 08:37
A) Not related to the topic
B) Incorrect comparison leading extending the cause and effect scenario
C) Mentions the reason for the depletion of the ozone layer but does not solve the paradox
E) Not related to the topic

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Joined: 04 Sep 2015
Posts: 559
Location: India
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Re: Most of the ultraviolet radiation reaching the Earths atmosphere from  [#permalink]

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09 Mar 2017, 12:31
Most of the ultraviolet radiation reaching the Earths atmosphere from the Sun is absorbed by the layer of stratospheric ozone and never reaches the Earths surface. Between 1969 and 1986, the layer of stratospheric ozone over North America thinned, decreasing by about 3 percent. Yet the average level of ultraviolet radiation measured at research stations across North America decreased over the same period.

Which one of the following, if true, best reconciles the apparently discrepant facts described above?

(A) Ultraviolet radiation increases the risk of skin cancer and cataracts; the incidence of skin cancer and cataracts increased substantially between 1969 and 1986.

(B) Between 1969 and 1986, the layer of stratospheric ozone over Brazil thinned, and the average level of ultraviolet radiation reaching the Earths surface in Brazil increased.

(C) Manufactured chlorine chemicals thin the layer of stratospheric ozone.

(D) Ozone pollution, which absorbs ultraviolet radiation, increased dramatically between 1969 and 1986.

(E) Thinning of the layer of stratospheric ozone varies from one part of the world to another and from year to year.

********************************************************************************************

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PreThinking:In Resolve the Paradox question one needs to link the two opposite premises.
=========================================================

A:Effects are out of scope.
B:layer over Brazil is out of scope.
C:Reson of thinning is out of scope.
D:Correct answer bacuse even when the ozone layer was depleted the pollutants which depleted the layer and absorb the UV radiation increased.,So the level of UV recieved at ground level was still low.
E:Not relevant information as layer over North america is discussed only,
Manager
Joined: 01 Sep 2016
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GMAT 1: 690 Q49 V35
Re: Most of the ultraviolet radiation reaching the Earths atmosphere from  [#permalink]

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Updated on: 30 Aug 2017, 07:31
Most of the ultraviolet radiation reaching the Earth's atmosphere from the Sun is absorbed by the layer of stratospheric ozone and never reaches the Earth's surface. Between 1969 and 1986. the layer Of stratospheric ozone over North America thinned, decreasing by about 3 percent. Yet. the average level of ultraviolet radiation measured at research stations across North America decreased over the same period.

Which one Of the following, if true, best reconciles the apparently discrepant facts described above?

a)Ultraviolet radiation increases the risk Of skin cancer and cataracts: the incidence of skin cancer and cataracts increased substantially between 1969 and 1986.

b)Between 1969 and 1986, the layer Of stratospheric ozone over Brazil thinned, and the average level of ultraviolet radiation reaching the Earth's surface in Brazil increased.

c)Manufactured chlorine chemicals thin the layer Of stratospheric ozone.

d)Ozone pollution, which absorbs ultraviolet radiation, increased dramatically between 1969 and 1986.

e)Thinning Of the layer Of stratospheric ozone varies from one part Of the world to another and from year to year.
_________________
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we shall fight on the landing grounds,
we shall fight in the fields and in the streets,
we shall fight in the hills;
we shall never surrender!

Originally posted by bkpolymers1617 on 30 Aug 2017, 01:10.
Last edited by broall on 30 Aug 2017, 07:31, edited 1 time in total.
Merged topic. Please search before posting question.
Re: Most of the ultraviolet radiation reaching the Earths atmosphere from   [#permalink] 30 Aug 2017, 01:10
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