Modern continental rocks carry chemical signatures from the very start of our planet's history, challenging current theories about plate tectonics.
Anderson will share some of his stories at the Gem, Mineral & Fossil Show – put on by the Black Hawk Gem & Mineral Society – at the Waterloo Center for the Arts, 225 Commercial St., on Sunday. The ...
A strange rock covered in tiny spheres may hold secrets to Mars’ watery — or fiery — past.
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