APES Unit 4 Review

Front

What is the correct order of soil horizons starting at the surface?

Back

O, A, E, B, C

Front

What texture does a soil sample with 60% clay, 30% silt, and 10% sand have?

Back

Clay

Front

What is the type of soil used most often with plants, consisting of a mixture of clay, sand, and silt?

Back

Loam

Front

Which horizon is made up of partially weathered rocks?

Back

Horizon C

Front

What are the proportions of sand, silt, and clay for a soil sample that is 5% sand, 95% silt, and 5% clay?

Back

5% Sand, 95% Silt, 5% Clay

Front

Define soil horizon.

Back

A layer of soil that differs in color, texture, and composition from the layers above and below it.

Front

What is the role of organic matter in soil?

Back

Organic matter improves soil structure, water retention, and nutrient availability.

Front

What is the difference between clay, silt, and sand in terms of particle size?

Back

Clay has the smallest particles, silt has medium-sized particles, and sand has the largest particles.

Front

What is soil texture?

Back

Soil texture refers to the relative proportions of sand, silt, and clay in a soil.

Front

What is the significance of the O horizon in soil?

Back

The O horizon is rich in organic material and is crucial for plant growth.