Plate tectonics

Discovery Science: Earth – Water – Oceanic Crust

by

Earth Science: Earth – Water – Oceanic Crust Oceanic crust covers two-thirds of the Earth’s surface. Crustal rocks are relatively recent, with none older than 200 million years, and they are constantly in motion. This movement expands the oceans and shifts entire continents. The oceanic crust begins beyond the flooded part of the continental shelf. … Read more

Discovery Science: Earth – Plate Tectonics – Primeval Continents

by

Earth Science: Plate Tectonics – Primeval Continents Pangaea, Laurasia, Gondwana: these names are taken from the Earth’s history. Today the outlines of these three former continents can be recon- structed on the basis of models simulating continental drift. The location of each continent today is the result of geologically recent tectonic changes. The further back … Read more