What did Rutherford discover that Thomson did not understand?

That most of an atom's mass was packed in the central nucleus.

Explanation:

Rutherford disproved Thomson's model in 1911 with his gold foil experiment, in which he demonstrated that the atom has a high-mass nucleus.

there is none because earth is stationary and flat.

shield volcanos are angry and get mad over the smallest things so much that there heads erupt   pahoehoe and a'a lava. a composite volcano is the poller opposite of a shield volcano. its   peaceful thing and knows how to control its emotions.