Can anyone explain and answer? Which physical change are both exothermic
A)condensation and evaporation
B)evaporation and melting
C)freezing and condensation
D)melting and freezing

I would say C.)

Explanation:

Freezing and condensation are both ways that heat is let out from an object.

b i think it’s a water wheel turning in a stream

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