tectonics What Are Earth Layers Made Of? By Rita R. McKenna Post a comment As a result of studies during the past century, geologists have a pretty clear sense of what the layers inside the Eart…
tectonics The Discovery of Sea-Floor Spreading By Rita R. McKenna Post a comment Military needs during World War II gave a boost to sea-floor exploration, for as submarine fleets grew, navies required d…
tectonics Evidence for Sea-Floor Spreading By Rita R. McKenna Post a comment Marine Magnetic Anomalies Recognizing anomalies For a hypothesis to become a theory, researchers must demonstrate that …
tectonics What Do We Mean by Plate Tectonics? By Rita R. McKenna Post a comment The paleomagnetic proof of continental drift ( plate tectonics ) and the discovery of sea-floor spreading set off a scie…
tectonics Convergent Plate Boundaries and Subduction By Rita R. McKenna Post a comment At convergent plate boundaries, two plates, at least one of which is oceanic, move toward one another. But rather than …
tectonics Transform Plate Boundaries By Rita R. McKenna Post a comment When researchers commenced to explore the bathymetry of midocean ridges in detail, they observed that mid-ocean ridges …
tectonics How Do Plate Boundaries Form and Die? By Rita R. McKenna Post a comment The configuration of plates and plate boundaries visible on our planet today has not existed for all of geologic history…
tectonics What Drives Plate Motion, and How Fast Do Plates Move? By Rita R. McKenna Post a comment We've now discussed the many facets of plate tectonics theory but to complete the story, we need to address a major…