Simplify the following text for a Grade 9 native English-speaking person.
Original: It deals with the physical lithologic , or rock type , change both vertically in layering or bedding of varying rock type and laterally reflecting changing environments of deposition , known as facies change .
Simplified: Lithostratigraphy deals with the physical rock type and how it changes from place to place . Changes in the rock ( facies change ) reflect changing environments of deposition .