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Soil Layers and Composition

Soil Layers and Composition

Assessment

Interactive Video

Biology, Science, Geography

5th - 6th Grade

Practice Problem

Hard

Created by

Patricia Brown

FREE Resource

The video tutorial explains the five layers of soil: organic layer, topsoil, subsoil, parent material, and bedrock. Each layer is described in terms of its composition and role in soil fertility and plant growth. The organic layer, or o-horizon, is rich in decomposed plant material, while the topsoil, or a-horizon, supports plant life. The subsoil, or b-horizon, is compact and supports long roots. The parent material, or c-horizon, consists of large rocks, and the bedrock is the solid rock foundation.

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6 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the organic layer of soil also known as?

a-horizon

c-horizon

b-horizon

o-horizon

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which layer of soil is primarily responsible for plant growth?

Parent Material

Subsoil

Topsoil

Bedrock

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the subsoil layer also referred to as?

o-horizon

b-horizon

c-horizon

a-horizon

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which layer of soil consists of large rocks and is known as the c-horizon?

Organic Layer

Bedrock

Parent Material

Topsoil

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the main composition of the bedrock layer?

Clay and minerals

Organic matter

Solid rocks

Decomposed plant remains

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which layer is the hardest and forms the foundation of the soil structure?

Parent Material

Subsoil

Topsoil

Bedrock

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