| Answer | Crossword Clue |
|---|---|
| RICHTER | ... scale (earthquake measurer) |
| SEISMOGRAPHER | Earthquake measurer |
| MOHS | .. scale (hardness measurer) |
| MOHS | ... scale (mineral hardness measurer) |
| MOHS | -- scale (mineral hardness measurer) |
| microseism | A very small earthquake, less than 2 on the Richter scale |
| microseisms | A very small earthquake, less than 2 on the Richter scale |
