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Chemical.
amino acids
Tundra.
In general, the thermal decomposition of a metal carbonate results in the formation of the metal oxide and carbon dioxide. Example: MCO3 ==> MO + CO2
The decomposition of sodium gas, I believe is 2NaClO,3--->NaCl+3O,2
Sorry about not knowing how to place a subscript on these, and apologies if this is not what your looking for, but here you go!