SPOTLIGHT FIGURE 3.28 Patternș of paleomagnetism and their explanatioň by plate tectonic theory. a When scientists conducted a magnetic survey of a spreading center, the Mid-Atlantic Ridge, they found bands of weaker and stronger magnetic fields locked in the rocks. b-d The molten rocks forming at the spreading center take on the polarity of the planet when they are cooling and then move slowly in both directions from the center. When Earth's mag- netic field reverses, the polarity of newly formed rocks changes, creating symmetrical bands of opposite polarity. normal polarity reversed polarity d Period of normal magnetism b Period of normal magnetism C Period of reverse magnetism New bands of oceanic crust alternate in polarity as they are formed. Normal polarity Reversed polarity Normal polarity Gary Hincks/National Geographic
SPOTLIGHT FIGURE 3.28 Patternș of paleomagnetism and their explanatioň by plate tectonic theory. a When scientists conducted a magnetic survey of a spreading center, the Mid-Atlantic Ridge, they found bands of weaker and stronger magnetic fields locked in the rocks. b-d The molten rocks forming at the spreading center take on the polarity of the planet when they are cooling and then move slowly in both directions from the center. When Earth's mag- netic field reverses, the polarity of newly formed rocks changes, creating symmetrical bands of opposite polarity. normal polarity reversed polarity d Period of normal magnetism b Period of normal magnetism C Period of reverse magnetism New bands of oceanic crust alternate in polarity as they are formed. Normal polarity Reversed polarity Normal polarity Gary Hincks/National Geographic
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
Related questions
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Thinking Analytically
As shown. Knowing the Atlantic’s spreading rate, how far apart would the blue normal-polarity blocks be 3 million years in the figure?
Transcribed Image Text:SPOTLIGHT FIGURE 3.28
Patternș of paleomagnetism
and their explanatioň by plate
tectonic theory.
a When scientists conducted a magnetic survey of a spreading
center, the Mid-Atlantic Ridge, they found bands of weaker and
stronger magnetic fields locked in the rocks.
b-d The molten rocks forming at the spreading center take on
the polarity of the planet when they are cooling and then move
slowly in both directions from the center. When Earth's mag-
netic field reverses, the polarity of newly formed rocks changes,
creating symmetrical bands of opposite polarity.
normal polarity
reversed polarity
d Period
of normal
magnetism
Transcribed Image Text:b Period
of normal
magnetism
C Period
of reverse
magnetism
New bands of oceanic crust
alternate in polarity as they
are formed.
Normal polarity
Reversed polarity
Normal polarity
Gary Hincks/National Geographic
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