"Composition of Soil" PPT

Description

"Composition of Soil" PPT

Part One: Soil Biology

Activity

1. Select a soil sample 50cm long, 50cm wide and 30cm thick in the soil where flowers, agricultural and forestry crops grow.

2. Use a small shovel to slowly dig out the soil in the sample and carefully observe whether there are other organisms in the soil sample.

3. Restore the soil sample to its original state.

4. Conduct a brief analysis of the observation results and fill in the table below.

Explore the organisms in the soil (extracurricular activity)

Tips:

1. Pay attention to safety when digging soil!

2. During the excavation process, attention should be paid to digging the soil in small amounts and not in lumps, so as not to miss the observation of soil animals.

3. After the observation, the soil should be restored to its original state, and the plants should not be moved or the roots of the plants should be damaged as much as possible.

Composition of soil PPT, part 2 content: non-living substances in soil:

Activity: Measuring the volume fraction of soil air

1. Put a piece of soil in the beaker (the volume of the soil is V), and slowly pour water until the water surface completely submerges the soil. Record the volume of water added to the beaker. Remember it as V1.

2. Replace the soil with an iron block equal to the volume of the soil and repeat the above experiment. Record the volume of water added. Remember it as V2.

3. The volume fraction of air in the soil is approximately (V1-V2)/V

Soil composition PPT, part 3: let’s discuss it together

1. Why do the amounts of water added to iron and soil blocks of the same volume differ?

There is air in the soil.

2. According to your experimental results, what is the approximate volume fraction of air in the soil to the volume of the soil?

Air accounts for approximately 15% to 35% of soil volume

3. Given a metal container (a ring knife, used for digging soil), an appropriate amount of water and a large enough measuring cylinder, how to measure the approximate volume fraction of air in the soil to the soil volume?

Thinking: Given you a crucible, a scale, an alcohol lamp and a scale with enough accuracy, how can you measure the volume fraction of water in the soil?

Idea:

1. First select a soil sample with a regular geometric shape (cuboid or cube), measure its relevant data with a scale, and calculate the soil volume V

2. Use a balance to weigh the soil sample mass M

3. Then mash the soil, place it on the crucible and heat it with an alcohol lamp to allow the water to fully vaporize and dissipate, and then call the mass M1

4. Convert the mass of water into volume V water = (M-M1)/ρwater

5. Calculate the volume fraction of water in the soil volume. (M-M1)/(ρwater·V)

Soil composition PPT, part 4 content: practice

1. Which of the following tools is suitable for observing soil organisms ( )

A. Microscope B. Telescope

C. Magnifying glass D. Electron microscope

2. Which of the following environments is most suitable for soil organisms to live in ( )

A. Dark, humid, oxygen-free environment

B. Hard, dark, aerobic environment

C. Warm, dry and dark environment

D. Dark, humid, warm and aerobic environment

3. This person uses a machine to loosen the soil in the vegetable greenhouse. Do you think his purpose of loosening the soil is to allow the roots of the crops to obtain rich nutrients from the soil ( )

A. Moisture B. Inorganic salts C. Microorganisms D. Air

Soil composition PPT, Part 5: Weathering of rocks

The surface of the earth's crust and the various rocks that make up the earth's crust are damaged or changed, which is called weathering of rocks.

The wind blew up the sand and bumped against the rocks. Over time, the rock layers were slowly worn away,

So holes and fissures appeared in the rock and grew larger and larger, finally breaking into small pieces.

Running water can cause large rocks to break into smaller pieces. In addition, when the water flows, the small rocks entrained rub against the rocks, causing the rocks to gradually turn into small stones.

Keywords: Zhejiang Education Edition eighth grade science PPT courseware for the second volume free download, soil composition PPT download, .PPT format;

For more information about the "Composition of Soil" PPT courseware, please click the "Composition of Soil" ppt tab.

"Composition of Soil" PPT courseware:

"Composition of Soil" PPT courseware Part 1: Living and non-living substances in soil 1. Life in soil Thinking In addition to various plants, are there other organisms in the soil? 2. Non-living substances in soil: Activity report: Phenomenon: Adding to soil..

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Update Time: 2024-08-30

This template belongs to science courseware Zhejiang Education Edition Eighth Grade Science Volume 2 industry PPT template

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