module 1he

• The seven primary lithospheric plates are: North American, Eurasian, Pacific, Indo-Australian, Australian, Antarctic, and South American.
• An earthquake releases 3 types of seismic waves: Primary, Secondary, and Surface waves.
• Surface Waves (L) move horizontally along the surface of the earth.
• Secondary Waves (S) have a slower speed compared to P waves but can be detected at greater distances.