Answer with Explanation:
The environment where the sediments are deposited gives an information regarding the rock that eventually forms.
The minerals and textures of the rocks can tell what kind of environment they were formed as they were being deposited. The fossils embedded in the rocks (sedimentary rocks) or the outcrops can also tell what happened on earth during those times. The process of rock accumulation also tells whether there was a high level of flood, strong winds or sub-arctic environments occurring.
This then gives an evidence of the earliest life forms on Earth.