Someone check my answers asap please, will give brainliest!! Find oxidation and reduction half-reactions to this equation

Oxidation: K (s) --> K+ (aq) + e
Reduction: Cu2+ + 2e --> Cu (s)

its first and third is your answer i did the qustion the fourth isnt right

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).