Help Astronut match the soil type to its definition.

Fill in the blanks with the following words: silt, sand, clay, regolith, humus, and loam.

1. ____________ is very fine soil particles; it is smooth and can hold nutrients, but water and air do not move through it well.

2. ____________ is soil possessing an ideal mixture of sand, humus, and clay for growing plants.

3. ____________ is a layer of loose rock and rocky debris sitting on the top of a hard surface; this is on the Moon and was produced by meteors striking the Moon's surface.

4. ____________ is the largest of the soil particles; it is very rough and does not hold water well.

5. ____________ is medium-sized soil particles; it feels smooth and can hold a lot of water, which moves easily through it.

6. ____________ among the richest and darkest of soils and develops from decaying plant and animal life.

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