Question

how does the inorganic portion of soil form?
soils get formed by melting and cooling processes.
heat and pressure change rocks into soils.
rocks get weathered by chemical and physical means to form soils.
sand and silt get deposited by rivers and streams.

Explanation:

The inorganic portion of soil is formed when rocks are broken down through chemical and physical weathering processes. Melting and cooling form igneous rocks, heat - and - pressure change rocks into metamorphic rocks, and deposition of sand and silt by rivers is part of sedimentation but not the main way soil's inorganic part forms.

Answer:

Rocks get weathered by chemical and physical means to form soils.