Natural Sciences and Technology Grade 5-B ... - Thunderbolt Kids
Natural Sciences and Technology Grade 5-B ... - Thunderbolt Kids Natural Sciences and Technology Grade 5-B ... - Thunderbolt Kids
QUESTIONS 1. Can you make pots with sand? 2. What kind of soil is good for making pots? Soil types -Sand, clay and loam As we saw previously, dierent soil samples collected from dierent places have dierent size particles. Imagine running along the beach and feeling the sand beneath your feet. Now imagine running through a forest over the soil. Can you see there are big dierences in these types of soil? The mixture of particles and the size of particles determines the soil type. There are 3 dierent types of soils: 1. Clay 2. Loam 3. Sand Let's look at the characteristics of the soil types. The types of soil. 112 Earth and Beyond
Sandy soil is the soil you find at the beach. It consists of large gritty particles and very tiny bits of rock which we call grains of sand. The grains of sand are coarse and the soil is loose. Can you see how in the picture of sandy soil, the grains can fall though your hand? It does not retain fertilisers. It is easily washed or blown away. It becomes warm quickly on asunny day. Plants do not grow well in sandy soil. Sandy soil has lots of coarse grains of sand. 6 QUESTIONS 1. Why do you think plants do not grow well in sandy soil? Sandy soil does not have any nutrients. It is easily blown away so plants can not form roots or roots become exposed. Sandy soil does not retain water. Have you ever made apot out of clay? If you are lucky enough to have done this or seen someone do it, you will know a bit about the properties of clay. Clay can be moulded. This is because it consists mainly of very fine particles which cling together. Clay gets sticky when wet. It retains fertilisers for a very long time. It is dicult for clay to be blown away or washed away. It does not become as warm as sandy soil. Clay soil consists of lots of very fine grains of clay and can be moulded into pots. Chapter 2. Surface of the Earth 113
- Page 70 and 71: The board makes bearings for the ax
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- Page 84 and 85: VISIT Short video showing the sun,
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- Page 100 and 101: Teacher's Note Iron melts at those
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- Page 106 and 107: VISIT Rocks erode to form soil (vid
- Page 108 and 109: ACTIVITY: Make a model of acid wate
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- Page 122 and 123: VISIT Interesting website about soi
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- Page 126 and 127: Set up the soils as you see in the
- Page 128 and 129: Which soil type do plants grow best
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- Page 132 and 133: Answer: Crust, mantle, core. 2. Wha
- Page 134 and 135: 3 Sedimentary rocks VISIT Dierent r
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- Page 150 and 151: VISIT When a T-Rex attacks! (video)
- Page 152 and 153: VISIT How are fossils formed? goo.g
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- Page 164 and 165: VISIT Finding the coelacanth (video
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QUESTIONS<br />
1. Can you make pots with s<strong>and</strong>?<br />
2. What kind of soil is good for making pots?<br />
Soil types -S<strong>and</strong>, clay <strong>and</strong> loam<br />
As we saw previously, dierent soil samples collected from<br />
dierent places have dierent size particles. Imagine running<br />
along the beach <strong>and</strong> feeling the s<strong>and</strong> beneath your feet. Now<br />
imagine running through a forest over the soil. Can you see there<br />
are big dierences in these types of soil?<br />
The mixture of particles <strong>and</strong> the size of particles determines the<br />
soil type. There are 3 dierent types of soils:<br />
1. Clay<br />
2. Loam<br />
3. S<strong>and</strong><br />
Let's look at the characteristics of the soil types.<br />
The types of soil.<br />
112 Earth <strong>and</strong> Beyond
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