Meera is an eleven-year-old student in India. She knows that her country is a part
of Asia, but because it is separated from the rest of the continent it is sometimes
called a

I think its city-state but Idk

Subcontinent

Explanation:

Because the Himalayan mountains seperate India from the rest of Asia, it is a subcontinent(subcontinent is a distinguishable part of a continent) and India has many geographical features of a continent, but it is not big enough to be one...which is another reason why its called subcontinent.

not clear

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