EarthRef.org Digital Archive (ERDA)
Development and Maintenance by the EarthRef.org Database Team
Detailed File Information
Illustration of Magnetic Anomalies Forming Along Mid-Ocean Ridge
332.00 KB - 2 files [ jpg,pdf ]
Middle School (Grade 6-8)
ERESE Database Team
Step-by-step formation of oceanic crust. Three illustrations depict the formation of magnetic anomalies along a mid-ocean ridge. Over geologic time, two tectonic plates move in opposite directions from the oceanic ridge, and magma rises to the sea floor and solidifies, recording the reversed or normal magnetic field orientation. This creates the striped pattern on the ocean floor. Note that the stripes have irregular boundaries and that they are not perfectly linear due to irregular distribution of volcanism at mid-ocean ridges.
Follow progression of seafloor formation from image (a) to image (c) and determine which image is the oldest and which image is the youngest representation.
magnetic anomalies, magnetic anomaly, magnetic reversals, magnetic stripes, mid-ocean ridge, seafloor spreading, spreading center, magnetic field reversal, diverging plate boundary
Enduring Resources for Earth Science Education (ERESE)
The object provided can be used freely for education or research purposes only.
EarthRef.org Copyright Disclaimer
for more information.
Source Web Site
Copyright Web Site
Persistent Link Current Web Page
Direct Download Link
Google Site Search
Browsers and Plugins
Webservices and Database Support by the
San Diego Supercomputer Center
Scripps Institution of Oceanography
College of Earth, Ocean and Atmospheric Sciences