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Home Q & A Board Science-Related Homework Help Geography and Earth Sciences
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ggull329 ggull329
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6 years ago

Sedimentary rocks made up of alternating thin layers of chert and iron minerals, mostly the iron oxides such as
  hematite and magnetite, are called ____.
  a. banded iron formations (BIFs)
  b. limestones
  c. sand dunes
  d. evaporates
  e. blue-green algae
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mikeman2332mikeman2332
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6 years ago
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ggull329 Author
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6 years ago
Smart ... Thanks!
bioc
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Yesterday
Brilliant ツ
lipop
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2 hours ago
this is exactly what I needed
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