Encyclopedia of geology, five volume set, volume 1 5 (encyclopedia of geology series) ( PDFDrive ) 135

Figure 2 Marine free air gravity anomaly map derived from satellite altimetry Sandwell and Smith 1997.. Warm colours indicate positive gravity anomalies.. The gravity anomaly primarily i

Figure 2 Marine free air gravity anomaly map derived from satellite altimetry (Sandwell and Smith (1997)) Warm colours indicate positive gravity anomalies The gravity anomaly primarily indicates the shape of the seafloor, due to the strong density contrast from seawater to oceanic crust Oceanic island chains, subduction zone trenches, and mid ocean ridges form features visible on this world map Locations ofFigures 4, 8 and 13indicated (Image courtesy of NGDC.)