Low density of Earth's core due to oxygen and silicon impurities

During accretion and differentiation of the Earth, chemical interactions in a silicate magma ocean and liquid iron drove silicon and oxygen impurities into what went on to become the liquid outer core. Contrasting with previous ...

Officials mull seismic tests near US nuclear plant

(AP)—Plans to use an array of powerful air cannons in an undersea seismic study near a Central California nuclear power plant have federal and state officials juggling concerns over marine life with public safety.

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