Answer:
They travel slower than P waves.
They result in much ground motion.
Explanation:
There are three types of seismic waves: P waves, S waves and Surface waves.
P wave are primary waves which require medium to travel. These are fastest waves. S waves are the secondary waves. These are transverse waves. S waves move slower than P waves. Both of these waves can travel through the inner layers of Earth.
Surface waves travel near the surface or above the surface of the Earth. These travel slower than S waves and P waves but have large amplitudes which could much ground motion and cause huge destruction.
Hence, the statements describe the surface waves:
They travel slower than P waves.
They result in much ground motion.