The Composition of Soil Horizons
The uppermost horizon, horizon O, in this profile is composed mostly of _________, while the lower horizon, horizon C, is composed mostly of _______.
A) silt; gravel.
B) gravel; rocks.
C) organic matter; rocks.
D) topsoil; organic matter.
Answer:
C) organic matter; rocks.
The uppermost horizon, horizon O, in this profile is composed mostly of organic matter, while the lower horizon, horizon C, is composed mostly of rocks.
Explanation:
-Soil contains the following major horizons, that is A, B, and C. Some soils may have horizon O, which may be thin or thick or even lack in some soils. This O horizon is found at the surface of many soils and normally contains organic materials at various decomposition stages, such as plants, leaves, and bugs.
-C horizon is the layer that is below the B horizon. It contains larger weathered fragments or broken up bedrock.
What are the compositions of horizon O and horizon C in the soil profile? The uppermost horizon, horizon O, is composed mostly of organic matter, while the lower horizon, horizon C, is composed mostly of rocks.