Soil minerals are formed from weathered rocks, and different rocks produce soil minerals with different textures.

• A. Soil forms only from organic matter.
• B. Soil minerals are formed from weathered rocks.
• C. Soil types do not vary with rock type.
• D. Soil forms instantly after rain.

Answer: (B)

Soil minerals come from the breakdown of rocks through weathering. As rocks are worn down, they release mineral grains—like quartz, feldspar, and mica—that become the mineral part of soil and determine its texture. Because different rocks have different mineral compositions, they produce soils with distinct textures over time.

That’s why the statement that soil minerals are formed from weathered rocks is the best choice. It reflects the origin of the mineral particles in soil.

The other ideas aren’t accurate: soil includes organic matter and living components, but the mineral grains themselves mainly come from weathered rock; soil types do vary with rock type because the available minerals differ by rock; and soil does not form instantly after rain—weathering and soil development take time.