Answer the following question given this paragraph: 

Did you ever see a meteor shower, like the one in Figure below ? Meteors burn as they fall through the mesosphere. The space rocks experience friction with the gas molecules. The friction makes the meteors get very hot. Many meteors burn up completely in the mesosphere.


Q: What happens to meteors as they fall through the mesosphere?

 Choices:

- they grow

- they bounce

- they stop suddenly

- they burn

A:
they burn
