Cross-section of the Earth (left) and the exoplanet Kepler-138 d (right). Like the Earth, this exoplanet has an interior composed of metals and rocks (brown portion), but Kepler-138 d also has a thick ...
Researchers created a seismic map of Earth's interior beneath the southeastern Pacific Ocean and discovered an ancient slab of oceanic crust that appears to be stuck midway through the mantle. When ...
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