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In Figure 2.9a, compare the orientation of the magnetic anomaly stripes near the Mid-Atlantic Ridge with the orientation of the ridge crest (highlighted by the red line). In Figure 2.9b, do the same for the Juan de Fuca Ridge (shown in yellow) and its associated magnetic anomaly stripes. (a) Are the individual anomalies oriented randomly? Are they parallel to the ridge crests? Oblique (at an angle) to the ridge crests? (b) Explain how the process of seafloor spreading can produce these orientations and relationships. (c) Some magnetic anomaly stripes are wider than others. Knowing what you do about seafloor spreading and magnetic reversals, suggest an explanation.

In Figure 2.9a, compare the orientation of the magnetic anomaly stripes near the Mid-Atlantic Ridge with the orientation of the ridge crest (highlighted by the red line). In Figure 2.9b, do the same for the Juan de Fuca Ridge (shown in yellow) and its associated magnetic anomaly stripes. (a) Are the individual anomalies oriented randomly? Are they parallel to the ridge crests? Oblique (at an angle) to the ridge crests? (b) Explain how the process of seafloor spreading can produce these orientations and relationships. (c) Some magnetic anomaly stripes are wider than others. Knowing what you do about seafloor spreading and magnetic reversals, suggest an explanation.

Applications and Investigations in Earth Science (9th Edition)
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
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In Figure 2.9a, compare the orientation of the magnetic anomaly stripes near the Mid-Atlantic Ridge with the orientation of the ridge crest (highlighted by the red line). In Figure 2.9b, do the same for the Juan de Fuca Ridge (shown in yellow) and its associated magnetic anomaly stripes. (a) Are the individual anomalies oriented randomly? Are they parallel to the ridge crests? Oblique (at an angle) to the ridge crests? (b) Explain how the process of seafloor spreading can produce these orientations and relationships. (c) Some magnetic anomaly stripes are wider than others. Knowing what you do about seafloor spreading and magnetic reversals, suggest an explanation.
Transcribed Image Text:In Figure 2.9a, compare the orientation of the magnetic anomaly stripes near the Mid-Atlantic Ridge with the orientation of the ridge crest (highlighted by the red line). In Figure 2.9b, do the same for the Juan de Fuca Ridge (shown in yellow) and its associated magnetic anomaly stripes. (a) Are the individual anomalies oriented randomly? Are they parallel to the ridge crests? Oblique (at an angle) to the ridge crests? (b) Explain how the process of seafloor spreading can produce these orientations and relationships. (c) Some magnetic anomaly stripes are wider than others. Knowing what you do about seafloor spreading and magnetic reversals, suggest an explanation.
FIGURE 2.9 Magnetic anomaly stripes in the Atlantic and Pacific oceans. Mid-Atlantic Canada Ridge axis United States Crest of Juan de Fuca Ridge Crest of Gorda Ridge Dark bands = positive (+) anomaly Light bands = negative (-) anomaly (a) The Mid-Atlantic Ridge southwest of Iceland. Dark bands = positive (+) anomaly Light bands = negative (-) anomaly (b) The Juan de Fuca and Gorda ridges in the North Pacific off the state of Washington and the province of British Columbia.
Transcribed Image Text:FIGURE 2.9 Magnetic anomaly stripes in the Atlantic and Pacific oceans. Mid-Atlantic Canada Ridge axis United States Crest of Juan de Fuca Ridge Crest of Gorda Ridge Dark bands = positive (+) anomaly Light bands = negative (-) anomaly (a) The Mid-Atlantic Ridge southwest of Iceland. Dark bands = positive (+) anomaly Light bands = negative (-) anomaly (b) The Juan de Fuca and Gorda ridges in the North Pacific off the state of Washington and the province of British Columbia.
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