Which of the following is not true of a scientific theory? it attempts to explain why things happen the way they do. it must be supported by many scientific investigations over time. it must be verified by scientists around the world. it is tested over time until it becomes a scientific law.

a,b

Explanation: because a scientific theory is something that been thought of and tested multiple times.

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