Question

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

Explanation:

The inorganic portion of soil is formed when rocks undergo weathering through chemical (like acid - rain reacting with rocks) and physical (like freeze - thaw cycles breaking rocks) processes. Melting and cooling form igneous rocks, heat and pressure form metamorphic rocks, and river deposition is part of sedimentation but not the main way inorganic soil forms.

Answer:

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