"What's in the Soil" The land where plants live PPT courseware 3

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"What's in the Soil" The land where plants live PPT courseware 3

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"What's in the Soil" The land where plants live PPT courseware 3

What life is in the soil?

Earthworms can break through hard, compact soil, making it easier for plant roots to expand and for air and water to enter the soil more easily.

Ants are insects that burrow in the soil

Burrowing animals such as mice build nests in the soil.

Snails and beetles live off decaying organisms.

Besides living things, what other materials are in the soil?

The top layer of sediment is clay. Use a small stick to pick a little bit and smear it on your hand. It will feel slimy and delicate;

Next are the sand grains, which become coarser toward the bottom;

Floating on the water are plant remains.

There is also humus and salt in the soil.

Humus is the black substance produced when plants and animals decay.

The leaves, roots and stems of plants are the main sources of humus.

Salt is a mineral dissolved in water.

They are all essential nutrients for plant growth.

what's in the soil

1. If you burn the soil, you will smell a burnt smell. This is because there are ( ) in the soil.

A. Moisture B. Clay C. Humus

2.The largest soil particle is ( ).

A. Gravel B. Sand C. Silt sand

3. Because there are ( ) in the soil, many small animals can live in the soil.

A.Sand B.Clay C.Air

4. The main function of earthworms in soil is ( ).

A. Provide salt to plants

B. Make it easier for plant roots to stretch and allow air and water to enter the soil more easily

C. Decompose animal and plant residues

what's in the soil

1. Soil is a mixture of water, air, sand, clay and humus. ( )

2. The color of soil is different in different places. ( )

3. Soil with more humus will have fewer small animals. ( )

4. Billions of organisms live in every cubic meter of soil. ( )

5. The smallest particles in soil are clay. ( )

6. After the soil is stirred in water and settled, it can be divided into several layers according to the size of the particles. ( )

7. The humus and salt in the soil are nutrients needed for plant growth. ( )

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For more information about the PPT courseware "What is in the soil, the land where plants live", please click the What is in the soil ppt, what is the land where plants live ppt tag.

"What's in the Soil" PPT courseware:

Qingdao edition of the second volume of third grade science, what is in the soil PPT courseware, the first part: classroom experiment

Experimental steps:

1. Put small clods of soil into water. What do you see? Explain what is in the soil?

2. Stir the soil and let it sit for a while.

"What's in the Soil" PPT:

Qingdao version of the third grade science volume 2, what is in the soil PPT, the first part of the content: methods to find the components of the soil. What I saw with the naked eye in the soil was that the soil was moist, with unbroken pebbles, grass roots and insects, and a magnifying glass with pebbles. Sand grains and powders of different sizes...

"What's in the Soil" The land where plants live PPT courseware 4:

"What's in the Soil" The Land Where Plants Live PPT Courseware 4 (1) Life in the Soil - Soil Biological Observation Observation Time Observation Location Environmental Characteristics Soil moisture, looseness, temperature, light, plant growth conditions and other environmental factors Soil Biology Earthworms ..

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Update Time: 2024-10-02

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"What's in the Soil" The land where plants live PPT courseware 3
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