Soil Formation, Composition, and Conservation

What type of process forms soil?

• weathering
• erosion
• deposition
• compaction

Which of the following is NOT an ingredient of loam

• clay
• sand
• shale
• silt

What is humus?

• soil
• organic matter
• loam
• minerals

Which of the following takes up approximately 50% of soil?

• water and humus
• water and loam
• air and loam
• air and water

Which soil texture do scientists believe to be the "ideal soil"?

• 30% Sand, 40% Silt, 30 % Clay
• 45% Sand, 5% Silt, 50% Clay
• 40% Sand, 40% Silt, 20% Clay
• 25% Sand, 25% Silt, 50% Clay

Which of the following orders sediment particle size from smallest to largest?

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

Which of the following is another name for the minerals in soil?

• Rocks
• Humus
• Organic Matter
• Loam

What are the layers in soil called?

• Layers
• Horizons
• Gradients
• Profiles

What makes up a soil profile?

• the percentages of air, water, minerals, and humus
• the type of minerals in the soil
• the horizons in soil
• the type of organic matter in the soil

Which of the following describes the size and proportions of particles in soil?

• soil texture
• soil fertility
• soil structure
• soil arrangement