A lithophone is like a musical instrument, but it's made out of rocks! Imagine taking a bunch of different rocks, which are different shapes and sizes, and hitting them with a stick or another rock. Each rock will make a different sound when you hit it, depending on how big it is and what shape it is.
People have been making lithophones for thousands of years. They've been found all over the world, from Africa to Asia to North America. Some are made with just a few rocks, while others have hundreds of different rocks that can be played in different ways.
One cool thing about lithophones is that they can make different kinds of sounds. Some lithophones are tuned to play specific musical notes, so you can play a melody on them like a piano or guitar. Others are more random, and make cool, interesting noises that don't follow any particular pattern.
Overall, a lithophone is a kind of musical instrument made out of rocks that you hit to make sounds. It's a fun way to explore the properties of different kinds of rocks and make some cool noises at the same time!