The Pacific seafloor laid down around 10 million years ago is dramatically enriched in beryllium-10, compared to older and younger layers. The geologists who discovered this spike propose it could ...

Now, researchers have found the first evidence of changes taking place over the past 20 years in the shape of the inner core. Signs of the core’s deformation appeared in waves from earthquakes ...

They have two dimensions – length and width. A polygon is a closed 2D shape with straight sides that meet at vertices. Polygons can be regular or irregular. If all the straight sides of a shape ...

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