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" ... Because nature often operates on a spectrum, you can also get stony-iron meteorites – geochemical hybrids with roughly equal parts metal and silicate mineral. There are a handful of oddities that blur or subvert the boundaries somewhat, but those are the basics. ... "
" ... Even so, finding a planet that is a “near analogue to the far-future Earth (an old-Earth-analogue)” could provide a means to test these predictions; including declines in species diversity, extent of habitat and ocean loss, and changes in such planets’ geochemical cycles. ... "
" ... Prior to this study, the assumption was that scarcity of oxygen molecules in the Martian atmosphere would also mean they were scarce throughout the subsurface. But the team’s analysis of geochemical evidence from Martian meteorites and manganese-rich rocks points to highly-oxidizing aqueous environments on Mars in its past, the authors note. This, they note, implies that O2 also played a role in the chemical weathering of the Martian crust. ... "
" ... There are both biological and geochemical origins for the limestone we find on Earth, making it one of the most abundant rocks on Earth's surface. It's generally thought that the vast majority of Earth's early CO2 atmosphere eventually wound up in our surface limestone. ... "
" ... To identify a given flag with its state of origin would require geochemical analysis – and even that process might prove inadequate – yet the ensemble is by no means monochromatic. Goldsworthy’s work is interesting for both the similarities and the differences between the flags. The similarities call out the artifice of political borders on a continent or even the whole planet. The differences call on each of us to be more observant of place, to take greater notice of the landscape. Goldsworthy’s flags are both emblems of tolerance and representations of geodiversity. They encourage recognition of unity and appreciation of difference, two of the values most needed in contemporary society. That they articulate those values in terms of ecology reinforces the connection between social and environmental justice. ... "