Soil and Soils Horizons

Which of the following is a layer of o horizon?

• a

• b

• c

• d

What is the correct order of soil horizons?

A. o horizon (humus or organic)

B. c horizon (substratum)

C. r horizon (bedrock)

D. a horizon (topsoil)

E. b horizon (subsoil)

F. e horizon (eluvial or leached)

• ADFEBC

• AFDCBE

• FDAECB

• BCEFAD

"Soil in this layer is dense and humid. It is rich in minerals (like iron, aluminum and silica) that have been leached from top horizons and deposited in this layer."

Which layer of soil described above?

• B horizon

• C horizon

• R horizon

• O horizon

According to the passage, which of the following is TRUE?

• Soil horizon can be grouped into seven types.

• A horizon also called topsoil.

• C horizon contains hard rocks.

• E horizon is rich of mineral, such ac iron, aluminum and silica.

Reading comprehension

Soil in this layer is leached. Soil particles and organic matter are washed out and deposited in lower layers of soil. Soil here is light in with fewer organic matter than the A horizon, but coarse-grained particles than the B horizon.

According to the passage, which layer of soil that the passage mentions?

• A horizon

• B horizon

• C horizon

• E horizon