Gravity map of the whole Earth

Gravity map of the whole Earth

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Credit: MARK SIMONS/CALIFORNIA INSTITUTE OF TECHNOLOGY, 1997/SCIENCE PHOTO LIBRARY

Caption: Gravity anomalies. Coloured free-air gravity anom- aly map of the Earth, centred on the Atlantic Ocean. These anomalies are the differences between the theoretical value for the gravity at the sur- face & the measured value. The colours range from purple (low gravity), through blue, green (normal), yellow, red to white (high). The anomalies are only a tiny fraction of the gravitational field strength, but they can provide information on the Earth's internal structure. The gravity low in Hudson Bay, Canada (upper left), occurs partly because the area's rocks are recovering from being compressed during the last ice age.

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Keywords: atlantic ocean, earth, earth science, free-air gravity anomaly map, globe, gravity anomaly, gravity map, image, images, photo, photos, sciences

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