Opinion: Trade war is a dirty business. Canada must not get dragged into the mud - The Globe and Mail

Scientists have discovered a mysterious rock in eastern Papua New Guinea that traveled to the underworld roughly 4.4 million years ago. The story it has to tell is strange indeed. As the rock journeyed deeper into our planet's interior, pushed by the forces of a subduction zone, its temperature did not do what scientists expected. At 45 kilometers below the surface, researchers estimate the rock became unusually warm, experiencing temperatures of about 700 °C (1,292 °F). That's hotter than models predict subduction zones should be at that depth. But that's not all. When the rock reached more than 90 kilometers (56 miles) deep, its temperature only rose by a further 100 °C. "What makes this rock so interesting is that it records two very different thermal conditions at different stages of its time deep inside Earth," says geologist Axel Schmitt from Curtin University in Australia. "At about 45 kilometers depth, the rock was surprisingly hot, but as it traveled deeper it entered an environment that was cooler than we would normally expect at that depth. "A tiny coesite inclusion inside a garnet crystal reveals that the rock traveled more than 90 kilometers beneath Earth's surface.

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