Final answer:
A P wave is a compression wave that travels through solids and liquids. It causes the initial jolt felt during an earthquake.
Step-by-step explanation:
A P wave is a type of compression wave that occurs during seismic activity. It is the fastest type of wave and travels through both solids and liquids. P waves cause the ground to move back and forth in the same direction as the wave is traveling. They are responsible for the initial jolt felt during an earthquake.
Learn more about P waves in seismic activity