Astronauts' bootprints on the Moon will stay fresh for a long time.
No rain, no wind will disturb these imprints.
Amazingly, footprints of other kinds of creatures have survived on the Earth.
This can be because they were quickly covered by volcanic ash, or other layers of fine material, preserving the details.
These footprints were most likely made by Australopithecus afarensis, an early human whose fossils were found in the same sediment layer.
They were found at Laetoli in Tanzania.
Looking at much older rocks, footprints of dinosaurs can be used to find out all sorts of things about their lives.
Working out the meaning of dinosaur footprints can be a great example of using scientific thinking.
The MEETING OF THE DINOSAURS is a wonderful activity for anyone who likes dinosaurs.