Soil Formation

Soil Formation

By Ammara Shahzad

What is soil?

•Soil is a loose mixture of rock fragments, organic matter, water, and air that can support the growth of vegetation.

Some text here about the topic of discussion

Multiple Choice

Soil is made up of:

• Water

• Rock fragments

• Air

• All of the these

Poll

Do you think soil is important?

• yes

• no

Open Ended

What causes soil to form?

1. •The first step in soil formation is the weathering of parent rock into smaller pieces.

2. • Very small particles from parent rock are mixed in with organic matter to form soil.

3. •Rock is broken down by weathering and plant root growth to form sediment.​

Steps of soil formation

Multiple Choice

The type of sediment in soil depends on the types of rocks in the area

• The different areas will have different types of soil

• Types of sediments in Soil are same everywhere

What causes Humus to form?

•Some microorganisms, such as bacteria and fungi, decompose the remains of plants and animals.

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•These remains are decayed organic matter called humus. It contains nutrients that plants need to grow.

Subject | Subject

Some text here about the topic of discussion

Multiple Choice

Humus is formed by decaying of dead plants and animal by___________.

• microorganisms

• bacteria

• fungi

• all of these

Poll

Do you know what is this ?

• yes

• no

​•Larger animals, such as earthworms and moles, loosen and mix the soil as they burrow, increasing the air in the soil and its ability to drain water.

Multiple Choice

6 Apply: How might a fallen leaf eventually become part of soil?

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• a. because of microorganism

• b. Changes into humus

• because of erosion

• both a and B

What factors determine how long it takes for soils to form?

•Four main factors determine how long it takes for soil formation and development.

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•These factors include:

1. Rock type

2. Climate

3. Topography

4. Plants and animals.

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Subject | Subject

Multiple Choice

Do plants and animals have any role in soil formation?

• Yes

• No

• Do not know

Open Ended

How was your today's lesson?