* Meteoroid: A small piece of rock or metal that travels through space.

* Meteor: The bright streak of light we see when a meteoroid enters the Earth's atmosphere and burns up.

* Meteorite: The remaining piece of a meteoroid that survives its journey through the atmosphere and lands on Earth.

So, the term that specifically describes the small chunks of rocks and debris in space that travel through the Earth's atmosphere and hit its surface is meteorite.