What is the term for waves that use matter to transfer energy?

Waves that transfer energy through matter are known as

All of the waves you have read about so far, even

sound waves, are mechanical waves. Water, the ground, a rope, and the

air are all made up of matter. Later, you will learn about waves that can

transfer energy through empty space. Light is an example of a wave

that transfers energy through empty space.

(I got this from your book)

the guest is my guess

b. our party quickly made its way into the cave / but we failed to find our host [the cyclops] himself inside.