Niagara falls is a good example of
a. kinetic energy being converted into potential
b. potential energy being converted into kinetic energy
c. energy being lost
d. energy being created
which one ? ^

B. Potential energy being converted into kinetic energy.    Hope this helps!

sodium (na), for example, has one electron in its valence shell. this is an unstable state because that valence shell needs eight electrons to be full. in order to fill its valence shell, find a way to add seven electrons to its valence shell