A piece of heated charcoal which is glowing in air burns more vigorously (strongly) when lowered into a bottle of pure oxygen. This is due to an increase in plzzz helppp

It's a

The reaction 2kalsi3o8 + 2(h+ + hco3-) + h2o  →  al2si2o5(oh)4 + 2k+ + 2hco3- + 4sio2 shows that feldspar kalsi3o8 is chemically altered by hydrolysis to form chalky-looking clay mineral kaolinite al2si2o5(oh)4. the chemical breakdown of potassium feldspar due to exposure to acidic water results to the mineral binding with the water molecule to become kaolinite with silica and potassium and bicarbonate ions in solution.

Its not chemical its not radiation and its not convection because there is not movement of fluids so it is thermal conduction