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"What's in the Soil" Earth's Surface and Its Changes PPT Courseware 2
Find the composition of soil
Method What I saw in the soil
To the naked eye, the soil is moist and contains small pebbles, grass roots and small insects.
Magnifying glass contains pebbles, sand grains of different sizes, and powdery particles
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. Observe the situation in the water cup after it has stood. What is in the water?
Precautions:
1. Earth clods should be handled with care.
2. Stir thoroughly.
3. The resting time should be long. The cup should also remain still while observing.
4. Always observe carefully and record what you see at every step. Read this and get started.
what's in the soil
1. Soil is a mixture of substances such as ____, ____, ____, ____, ____ and ____.
2. Soil particles can be classified according to their particle size. From large to small they are ____, ____, ____ and ____.
3. Put the soil into the water and find bubbles coming out, which means there is ____ in the soil. Soil also contains ____ and ____ that plants need to grow.
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
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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"What's in the Soil" Earth's surface and its changes PPT download:
"What's in the Soil" The Earth's Surface and Its Changes PPT Download Part One Content: Collaborative exploration to find the composition of the soil Experimental methods Naked eye observation, magnifying glass observation, soil deposition experiment Experimental steps 1. Put the soil brought back from the wild on paper ,First with..
"What's in the Soil" Earth's surface and its changes PPT:
"What's in the Soil" The Earth's Surface and Its Changes PPT Part One: Finding the Composition of Soil Find some soil on campus or in the field, pack it in a plastic bag, and bring it back to the classroom. Pour the soil onto a piece of paper, first observe what is in the soil with your naked eyes, and then use magnification...
"What's in the Soil" Earth's Surface and Its Changes PPT Courseware 4:
"What's in the Soil" Earth's Surface and Its Changes PPT Courseware 4 What's in the Soil? Experimental steps: 1. Put small clods of soil into water. What phenomena do you see? Explain what is in the soil? 2. Stir the soil and let it sit for a while. While waiting...