Great Oxidation Event
What controlled the rise and fluctuations of atmospheric oxygen about 2.4 billion years ago?
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Paleocene–Eocene Thermal Maximum carbon sources
Which carbon sources triggered and amplified the rapid warming about 56 million years ago?
Great Unconformity
Which erosion histories produced the huge gaps beneath many younger sedimentary rocks?
Deep long-period volcanic earthquakes
What produces unusual low-frequency seismic signals deep beneath volcanoes?
Hydrogen generation by serpentinization
How quickly do water and iron-bearing mantle rocks generate hydrogen underground?
Messinian salinity crisis
How much water remained in the Mediterranean during the crisis’s final freshwater-influenced stage?