Passive seismic

Passive seismic is when scientists listen for different kinds of waves that come from the earth. The earth is like a big ball, and sometimes it moves and shakes. When it does this, it makes different kinds of waves, like sound waves that people can hear or waves in the water at the beach. These waves can be picked up by special machines, which scientists use to study the inside of the earth.

Passive seismic can tell scientists a lot of important things about the earth, like how deep it is and what it's made of. It's like taking a picture of the inside of the earth without having to dig a big hole. Scientists can use this information to learn about how the earth is changing over time, and what might happen in the future. It's a really important tool for scientists who want to understand our planet better!