Formation of Soil

A Plants put air into soil.

B Rocks break down plants into soil.

C Water gets into soil through plant roots.

D Pieces of dead plants become part of soil.

A sandy

B clay

C humus

D hummus

A When the worm digs, it lets air into the soil.

B . When the worm digs, it breaks down rocks into the soil

C When the worm digs, it turns the soil into clay soil.

erosion

weathering

deposition

humus

True

False

warm, dry, few living things, and flat

cool, wet, lots of living things, and flat

cool, dry, lots of living things, and steep

warm, wet, lots of living things, and flat

water, plants, air, sunshine

water, inorganic matter, air, rock fragments

water, organic matter, air, rock fragments

water, dirt, organic matter, air

organic matter

inorganic matter

minerals

water

soil has rock fragments and dirt does not

dirt has rock fragments and soil does not

soil is rich in organic matter, but dirt is not

dirt is rich in organic matter, but soil is not