I think this is because the molecules in the rock are so small. The rock is also a solid.
Photoexcitation<span> is the photoelectrochemical process of electron excitation by photon absorption, when the energy of the photon is too low to cause photoionization. The absorption of the photon takes place in accordance with Planck's quantum theory.</span>
Answer:
C. 200 billion
Explanation:
The milky way galaxy is estimated that there is 200 billion stars
