Waves transfer energy without transferring matter.

There are two main types of waves: mechanical and electromagnetic.

Sound waves are mechanical waves that need a medium to travel.

Light waves are electromagnetic waves and can travel through space.

Waves have properties like wavelength, frequency, and amplitude.

The higher the frequency, the higher the energy of the wave.

Reflection, refraction, and diffraction are ways waves can change direction.

Seismic waves from earthquakes help scientists study Earth's interior.

Ocean waves are caused mainly by wind blowing across the surface.

Waves can interfere constructively (build up) or destructively (cancel out).