parent material वाक्य

Loess covers most of the hills and forms the parent material of a brown silt loam soil.
Obsidian is the rock formed as a result of quickly cooled lava, which is the parent material.
The exposure of parent material to favourable conditions produces mineral soils that are marginally suitable for plant growth.
The soils are of residual-colluvial parent material which are igneous rocks; grained diorite and shale.
They form in soil parent material that contains calcium carbonate or receive regular inputs of carbonates through dust.

These differences relate to climate, topography, and geological history leaving behind different sources of parent material.
What is the reason for this variation if parent material remains same, with no change in chemical properties?
The developmental sequence of Solonetzic soils is commonly from saline parent material to Solonetz, Solodized Solonetz and Solod.
Iron oxide can be present or absent, and the soil is generally derived from a sandy parent material.
When reordered to climate, relief, organisms, parent material, and time, they form the acronym CROPT.