Rocks & Soil

The O Horizon contains mostly..

• Organic Matter

• Rocks

• Boulders

• Houses

Answer explanation

Remember that the O Horizon is made up mainly of organic matter such as leaf litter. A trick to remember..... O Horizon & (O)rganic.

Tags

NGSS.MS-LS2-3

Reorder the following soil layers from BOTTOM layer to TOP layer.

• Bedrock

• Subsoil

• Topsoil

• Parent Material

• Humus

The A Horizon is to the ​ (a)   , the B Horizon is to the ​ (b)   .

• topsoil
• subsoil
• parent material
• humus

Answer explanation

The A Horizon belongs to the topsoil, containing rich organic matter, microorganism activity and the place where seed germination takes place.

The B Horizon belongs to the subsoil, containing less humus and organic matter, it is more compacted, and good at storing water!

The R Horizon contains mostly ​ (a)   ​

• solid rock
• Humus
• Organic Matter
• Broken tree roots
• Microorganisms

Answer explanation

The R Horizon is the bottom layer of the soil, containing solid rock, and sheets of granite, quartzite, basalt and sandstone.

Tags

NGSS.MS-ESS1-4

NGSS.MS-ESS2-2

NGSS.MS-ESS2-3

Match the following soil horizons to their features.

• organic matter and leaf litter

• A Horizon

• rich in organic matter, where seed germination takes place

• C Horizon

• large broken rocks, broken tree roots

• O Horizon

• pale color, leaching nutrients from upper layers

• B Horizon

• more compacted soil

• E Horizon

Tags

NGSS.MS-LS2-3

Which is NOT a layer of the soil?

• Topsoil

• Subsoil

• Bottom Soil

• Parent Material

Answer explanation

Bottom soil is NOT a layer of the soil.

What is HUMUS made from?

• The remains of decayed plants.

• Both

• The remains of decayed animals.

Tags

NGSS.MS-LS2-1

What is a mixture of weathered rock, decayed organic matter, mineral fragments, water, and air called?

• soil
• organic matter
• decomposed matter

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-3

What is the remains of something that was once alive?

• inorganic matter
• organic matter

Tags

NGSS.MS-LS4-1

Texture of Soil:
Sand feels...

• rough
• smooth
• sticky