Vibrations in materials set up wavelike disturbances that spread away
from the source. Sound and earthquake waves are examples. These and other
waves move at different speeds in different materials.
| NSES Content Standard B
Physical Science: Interactions of energy and matter Grades 9-12, page 180 Waves, including sound and seismic waves, waves on water, and light waves, have energy and can transfer energy when they interact with matter. |