What is the density of a block of marble that occupies 249 cm3 and has a mass of 937 g? Answer in units of g/cm3.

Mars contains iron oxide in its crust

The answer is d i think

Firstly, the planetary model of the atom  failed  to explain why individual atoms produce discrete  line spectra. in fact, according to rutherford's model, each individual atom should produce a  continuous  line spectrum. the second flaw to his model was the fact that electrons orbit the nucleus in a circular fashion.

D, because it can be proved either wrong or right.