* A boy observes a piece of stone at the bottom of a river 60 m deep. It he looks vertically from the surface of the river, how far does the stone appear to be from him?
[Refractive index of water
A. 80 m
B. 4.5 m
C.6.0 m
D. 5.5 m

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

Some type of thing that was invisible

Wind or electric energy force force of friction

The rocks expand when there hot/warm  and contract when they are cold.