Sentences with phrase «ago from seawater»
The team examined a range of fossils unearthed from limestone rocks in Siberia, which formed millions of years ago from seawater with high levels of calcium carbonate.
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Several years ago, Jon Zehr and his colleagues at the University of California, Santa Cruz, discovered fixation genes in seawater that looked like they came from single - celled bacteria.
«Last time, we made the seawater less acidic, like it was 100 years ago, and this time, we added carbon dioxide to the water to make it more acidic, like it could be 100 years from now,» Caldeira explained.