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8 ] T! n+ j5 JCOVER Polished thin section (70 micrometers) of volcanic glass, sample ) E' Z+ j7 N. P
catalog number NMNH115296-3, in transmitted light (14 by 18 millimeters). Molten 9 I8 T1 Q2 Z; }$ c0 ~8 v
lava erupted onto the sea floor freezes to glass and minerals that contain clues / y8 X a# W% _ { Y
to the lava's ancient past and origin in Earth's deep interior. Volcanic glasses ; ]* Z8 k& D- [' f4 L. k- \" T
such as this one may reveal a link between Earth's oxidation state and the deep
4 P$ R8 n% f0 p; ?# }, r E: hcarbon cycle. See page 1314. b* t) P# ^& t5 s7 C
Image: G. Macpherson, T. Gooding, and E. Cottrell
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