earth layers
contains living materials, like leaves, needles, moss and more
humus
its made mostly made of minirals, most tree roots live here. it is darker due to all of the decaying plants and animal feces
topsoil
it is made of sand, silt and clay that is not fully brocken down. it has less organic matter. it has a lighter color
subsoil
it is mostly rock that has been slightly weathered. not alot lives down here, exept giant tree roots
parent material
it is a solid rock layer
bedrock