Chalk is calcium carbonate (CaCO3). If it gets hot, it releases CO2.
Moron.....
“Chalk is calcium carbonate (CaCO3). If it gets hot, it releases CO2.
Moron.....”
To be fair it takes temps over 800C at surface pressure and even more at lower pressures to calcinate CaCO3 to CaO that’s why cement kilns burn thousands of cubic meters of natural gas per year to drive that reaction it’s how you make quicklime for concrete. The sun simply cannot drive that reaction in the upper.atmosphere even UV light photon energy levels are too low. Maybe cosmic rays with GEV gigaelectron volt energy levels but then you also smashed the atoms themselves to quarks muons and stranglets or neutrinos.