Soil Horizons

Soil structures change with _____________.

• temperature

• depth

• moisture

• elements

Tags

NGSS.MS-ESS2-4

Soil near the surface contains the most ____________.

• air

• clay

• humus

• moisture

What is the top layer of the soil named?

• topsoil

• R-horizon

• O-horizon

• subsoil

What location contains thicker O-horizons?

• Forests

• deserts

• grasslands

• ocean floor

What part of the soil is the A-horizon?

• subsoil

• bedrock

• topsoil

• rocks

Subsoil is part of the _______ horizon

• A-horizon

• O-horizon

• C- horizon

• B-horizon

The parent material and/or bedrock is called the

• R-horizon

• humus

• subsoil

• organic material

This section of soil that is rich in humus and minerals is the __________.

• sand and silt

• rock fragments

• Topsoil (A-horizon)

• subsoil (B-horizon)

Which section of soil is poor in humus but rich in materials?

• subsoil (b-horizon)

• D-horizon

• bedrock

• C-horizon

Humus is found on top of the __________ horizon

• A

• B

• C

• D