Earth's magnetic field is not stable; throughout geologic time it has changed direction.This change is attributed to
A) changes in the direction of fluid flow in the molten outer core of Earth.
B) magnetic pole reversals.
C) fluctuations in the time / space continuum.
D) changes in the direction of fluid flow in the molten inner core of Earth.
Correct Answer:
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Q20: Motion in a P-wave is
A)side to side.
B)transverse.
C)longitudinal.
D)up
Q21: The outer core
A)has a plastic-like flow.
B)flows fast
Q22: The Mohorovicic discontinuity marks the change in
Q23: The asthenosphere is part of the
A)crust.
B)lithosphere.
C)mantle.
D)outer core.
Q24: The Mohorovicic discontinuity occurs because of a
A)change
Q26: The Mohorovicic discontinuity was discovered by observing
A)earthquake
Q27: The thickness of Earth's crust
A)varies from 10
Q28: Because S-waves do not travel through Earth's
Q29: The outer core is
A)rock.
B)plastic.
C)liquid.
D)the source for volcanoes.
Q30: The upper mantle can be divided into
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