Question

1. what type(s) of wave is known as seismic waves? 1 point primary wave secondary wave surface wave primary and secondary wave primary, secondary, and surface wave 20. what type(s) of wave creates shadow zones? 1 point primary wave secondary wave surface wave primary and secondary wave primary, secondary, and surface wave

Explanation:

For question 19: Seismic waves are the waves generated by earthquakes, and they include three main types: Primary (P) Waves, Secondary (S) Waves, and Surface Waves. All three fall under the category of seismic waves.
For question 20: Both Primary and Secondary waves create shadow zones as they interact with the Earth's internal layers; P waves have a smaller shadow zone, while S waves have a larger one because they cannot travel through the liquid outer core.

Answer:

1. Primary, Secondary, and Surface Wave
2. Primary and Secondary Wave