What kind of mixture is the gravel at the bottom of the fish tank?

Hey there! I’m Raegan and i believe the answer is “Rock”. Thank you for your time.

This is what i found on google “what happens to the bond angle when you add or remove an electron domain? the bond angle decreases as you add domains 5. can you force the atoms into new configurations by pushing atoms around? note: we can think of a bond or a lone pair of electrons as a “domain” of electrons.” i hope this you