Which soil region tends to accumulate mineral ions but relatively little organic matter, and is generally penetrated by mature tree roots?

Name: Which soil region tends to accumulate mineral ions but relatively little organic matter, and is generally penetrated by mature tree roots?
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Question

Quizplus · Accepted Answer

The B horizon, also known as the subsoil, accumulates mineral ions leached from the A horizon above it and contains less organic matter. It is often penetrated by mature tree roots.

Which Soil Region Tends to Accumulate Mineral Ions but Relatively