We just learned about the seismite.
Another part of earthquake science is Speleoseismite.
In caves there are things called stalagmites that grow from the floor, and stalactites growing from the ceiling.
Sometimes during earthquakes these break, or sometimes cave ceilings collapse.
These broken or tilted rock growths are the speleoseismites, and they can be used to study earthquakes that happened a long time ago.
(from: wikipedia - speleoseismite)
Kid Facts - Blast from the past: Milling
