Here's why:
* Mechanical waves require a medium (like air, water, or a solid) to travel. They transfer energy by causing the particles of the medium to vibrate. This vibration is a back-and-forth motion, essentially pushing and pulling on the neighboring particles.
Here are some examples of mechanical waves:
* Sound waves: Travel through air by compressing and expanding the air molecules.
* Water waves: Travel through water by causing the water molecules to move up and down and back and forth.
* Seismic waves: Travel through the Earth's crust and mantle by pushing and pulling on the rock.
In contrast, electromagnetic waves (like light) do not require a medium to travel and can move through a vacuum. They are made of oscillating electric and magnetic fields.
