Soil Practice

SOIL LAYERS ARE CALLED.......

• MATERIALS
• ORGANIC
• HUMUS
• HORIZONS

THIS HORIZON IS MADE OF DECAYING LEAVES, TWIGS AND ANIMAL REMAINS/WASTES......

• A
• B
• C
• O

MIXTURE OF ROCK, MINERAL PARTICLES, AND ORGANIC MATTER...... 

• HORIZONS
• HUMUS
• SOIL
• CLAY

SLIGHTLY BROKEN UP ROCK.....

• C
• D
• O
• A

MORE MATURE SOIL HAS MORE HORIZONS......

• FALSE
• TRUE

WHAT LAYER IS TOPSOIL FOUND IN........

• A
• B
• C
• D

Examine the soil profile below. Note there are many ground cover plants and a tree with deep roots.

Which soil horizon is primarily responsible for this soil’s fertility?

• Topsoil, because it contains humus and other organic nutrients that plants need.

• Subsoil , because plant roots can grow down into the smaller rock fragments.

• Parent material, because most of the groundwater is stored in this horizon.

• Bedrock, because it is the parent rock that breaks up to form soil.

Which soil horizon typically contains the least organic materials?

• horizon, topsoil

• horizon, subsoil

• horizon, parent material

______ is the ideal soil combination of sand, silt, and clay

• silty clay

• sandy clay

• loam

• sandy silt

Three funnels were filled with equal volumes of pebbles, fine sand, and coarse sand, as shown in the diagram below. The same amount of water was poured into each funnel.

Which correctly lists the order in which the water passed through the funnels, from fastest to slowest (permeability)?

• pebbles, fine sand, coarse sand

• pebbles, coarse sand, fine sand

• fine sand, coarse sand, pebbles

• coarse sand, pebbles, fine sand