Members of the European Union (EU) work together and set policies that aim to ensure the free movement of people, goods, and services. Which type of region does this display? (WG 1.3)
formal
O physical
O perceptual
functional

seismic wave -

an elastic wave in the earth produced by an earthquake or other means.

explanation:

true. earthquakes are felt whenever there is a slip around a fault in the rocks below the earth. this reorientation of faults create sesmic waves and is known as earthquake, the severity of which is measured in richter scale. these are more prominent in hilly regions as the rocks usually form faults to balance the pressures on it.