Fact 1: An earthquake causes the ground to shake.

Fact 2: Seismometers measure earthquakes.

Given the two facts above, answer the question "What measures the shaking of the ground" with the following options: 
- Seismometer
 - sensory neurons
 - Hygrometer
 - Speedometer
 - heat energy
 - kinetic energy
 - Force gauge
 - power stations


 

 Seismometer        