The ocean floor spreading showed that it is possible for landmasses to move.
The Richter scale is used, from 0.1 to 9.0 magnitude. The Richter scale is determined from the logarithm of the amplitude of waves recorded by seismographs.
Geography is literally 'the study of Earth' from 'ge (γη)' meaning earth and 'grapho (γραφω)' to write or to study.
The ninth planet is Pluto, but this was ruled a dwarf planet in 2006. It has a small surface area than Russia.