The axis of Earth s daily rotation is tilted with respect to : GMAT Critical Reasoning (CR)
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# The axis of Earth s daily rotation is tilted with respect to

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Manager
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The axis of Earth s daily rotation is tilted with respect to [#permalink]

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01 Dec 2005, 07:23
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The axis of Earthâ€™s daily rotation is tilted with respect
to the plane of its orbit at an angle of roughly 23
degrees. That angle can be kept fairly stable only by
the gravitational influence of Earthâ€™s large, nearby
Moon. Without such a stable and moderate axis tilt, a
planetâ€™s climate is too extreme and unstable to
support life. Mars, for example, has only very small
moons, tilts at wildly fluctuating angles, and cannot
support life.
If the statements above are true, which one of the
following must also be true on the basis of them?
(A) If Mars had a sufficiently large nearby moon,
Mars would be able to support life.
(B) If Earthâ€™s Moon were to leave Earthâ€™s orbit
Earthâ€™s climate would be unable to support
life.
(C) Any planet with a stable, moderate axis tilt can
support life.
(D) Gravitational influences other than moons have
little or no effect on the magnitude of the tilt
angle of either Earthâ€™s or Marsâ€™s axis.
(E) No planet that has more than one moon can
support life.
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01 Dec 2005, 07:36
only B is correct.

A is a possibility but there can be more than one reason. if one is met but the others are not met, it doesn't work.

C same as see.

D this is inferring too much. there can be other reasons as well.

E is out of scope.
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01 Dec 2005, 23:00
IMO its D

cause if D is not true then the stumula can not be true i.e there are other factor which control the tilt ..
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02 Dec 2005, 02:21
I think it should be D.
What is the OA?
Manager
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03 Dec 2005, 01:14
OA is B
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13 Nov 2007, 10:49
Gauss wrote:
The axis of Earthâ€™s daily rotation is tilted with respect
to the plane of its orbit at an angle of roughly 23
degrees. That angle can be kept fairly stable only by
the gravitational influence of Earthâ€™s large, nearby
Moon. Without such a stable and moderate axis tilt, a
planetâ€™s climate is too extreme and unstable to
support life. Mars, for example, has only very small
moons, tilts at wildly fluctuating angles, and cannot
support life.
If the statements above are true, which one of the
following must also be true on the basis of them?
(A) If Mars had a sufficiently large nearby moon,
Mars would be able to support life.
(B) If Earthâ€™s Moon were to leave Earthâ€™s orbit
Earthâ€™s climate would be unable to support
life.
(C) Any planet with a stable, moderate axis tilt can
support life.
(D) Gravitational influences other than moons have
little or no effect on the magnitude of the tilt
angle of either Earthâ€™s or Marsâ€™s axis.
(E) No planet that has more than one moon can
support life.
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13 Nov 2007, 18:50
Gauss wrote:
The axis of Earthâ€™s daily rotation is tilted with respect
to the plane of its orbit at an angle of roughly 23
degrees. That angle can be kept fairly stable only by
the gravitational influence of Earthâ€™s large, nearby
Moon. Without such a stable and moderate axis tilt, a
planetâ€™s climate is too extreme and unstable to
support life. Mars, for example, has only very small
moons, tilts at wildly fluctuating angles, and cannot
support life.
If the statements above are true, which one of the
following must also be true on the basis of them?
(A) If Mars had a sufficiently large nearby moon,
Mars would be able to support life.
(B) If Earthâ€™s Moon were to leave Earthâ€™s orbit
Earthâ€™s climate would be unable to support
life.
(C) Any planet with a stable, moderate axis tilt can
support life.
(D) Gravitational influences other than moons have
little or no effect on the magnitude of the tilt
angle of either Earthâ€™s or Marsâ€™s axis.
(E) No planet that has more than one moon can
support life.

A: Resonable, but there may be other factors that go into supporting life.
C: Too extreme
D: This is unlikely other celestial bodies exist and probably have effect on the tilt.
E: Too extreme

B is the best answer here b/c life is already supported here so other factors dont have to be considered as in A.
Re: CR Axis rotation   [#permalink] 13 Nov 2007, 18:50
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