Re­mains of Earth’s First Crust Dis­cov­ered

Science Illustrated - - SCIENCE UPDATE -

In rocks in North-East­ern Canada, sci­en­tists have sur­pris­ingly dis­cov­ered 4.3+-bil­lion-year-old re­mains of Earth’s orig­i­nal crust. The crust made up the world’s ex­te­rior layer for the first few hun­dred mil­lion years fol­low­ing the planet’s ori­gin, but it was later bro­ken down or sank to­wards the in­te­rior of the planet. So, sci­en­tists be­lieved that the old crust had dis­ap­peared, but the new dis­cov­ery shows that it is not so. Ge­ol­o­gists from the Univer­sity of Ot­tawa stud­ied 2.7-bil­lion-yearold rock along Hud­son Bay and found a high con­tent of neodymium-142. The rare ma­te­rial was only pro­duced for the first 500 mil­lion years of Earth’s ex­is­tence, and so, sci­en­tists were able to con­clude that the Cana­dian rock formed in a remelt­ing of the orig­i­nal crust.

Sci­en­tists found traces of our planet’s orig­i­nal crust in Cana­dian rock.

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