How do rocks provide evidence of past events?

Scientists can see th fossils and the living organisms.

It can provide evidence of the environment the area was in in the past. For example, if you found a fossil with tentacles, you could guarantee that it is a marine creature (as tentacles are useless...

changes in the environment e.g. the place, temperature, climate.

They also record the history of life and climate.

As long as humans dont come along and mess it up, the earth is like a big recording machine, you just have to study the right things to unravel the coded information everything contains.