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Digital Subscriptions > Rock&Gem Magazine > February 2019 > EARTH SCIENCE IN THE NEWS

EARTH SCIENCE IN THE NEWS

RETHINKING EARTH’S CORE WHILE INVESTIGATING MARS

Looking Inward: A Solid Yet Soft-Hearted Earth

Earth has oThen been compared to a manylayered onion. There’s a solid and brittle crust, a squishy mantle, a fluid outer core, and a solid inner core. At least, that’s what we used to think.

A report in the journal Science notes Earth’s inner core has long been thought to be made of solid iron, an assumption that has ruled since the existence of that inner core was confirmed over 80 years ago, in 1936. This assumption is due in part to studies of seismic J waves, or “shear waves”, that pass all the way through our planet during seismic events (e.g., earthquakes).

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Beckett Rock & Gem February 2019, Collector Corner : Chasing Thunder Eggs & More, Favourable Fossicking : Exploring Australia's Lava Plains, WULFENITE : A Symphony of Color and Contrast, And More.....