SOIL

Soil is 

• Weathered Material
• Weathered material and organic matter
• Weathered material, organic matter, air and water.
• Bedrock

A soil horizon 

• is a layer of soil that differs in color and texture from the layers above or below it.
• refers to bedrock.
• refers to layers that are like one another.

The top layer is 

• consists of A and B horizons
• is made up of topsoil called the A horizon
• refers to top and the subsoil

Pick the correct letter of the choice that lists soil particles from the largest to the smallest.

• sand, gravel, clay, silt
• gravel, sand, silt, clay
• gravel, silt, sand, clay
• gravel, sand, clay, silt

Decomposers are 

• a loose layer of leaves and other plant materials on top of it.
• decayed plant and animal remain
• loose weathered material on Earth's surface in which plants can grow.
• organisms that break down animal and plant remains and wastes

Litter is 

• decayed plant and animal remains
• a loose layer of leaves and other plant materials on top of soil.
• Horizon A

Humus 

• A dark colored substance that forms as plants and animal remains decay
• another name for litter.
• the leaves that plant shed which forms a loose layer on soil.

Fungi, bacteria and worms 

• are all living creatures.
• form the base of a food chain.
• are the main soil decomposers.

Loam is 

• soil made of about equal parts of clay, sand and silt.
• soil that contains more sand than silt or clay.
• soil that contains only clay.
• soil that has no silt.

The B horizon

• contains partly weathered rock
• contains clay and other particles leached from horizon A. Contains very little humus.
• is like horizon A