Through which process was oxygen added to Earth’s atmosphere? A.
Photosynthesis
B.
Volcanic eruption
C.
Cellular respiration
D.
Meteor collision

the mass of the cathode increases because ions from the solution get reduced to atoms and become part of the cathode.

explanation:

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c, liquids evaporate, creating a gas

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3