The earth is changing all the time. Some changes are slow, but some, like earthquakes are fast. An earthquake is a subject of the earth that happens under the earth's crust and under the ocean. Earthquakes mostly happened in California because thier was a big crack in thier. The thing that causes the earthquakes is the plates under the earth's surface. that can make a earthquake or a tsunami. People say the famous crack is on the Liberty Bell, but that wasen't an earthquake, the real famous crack was in Californa.
How's that for scientific thinking??????