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
Teacher's Note Iron melts at those temperatures, but the iron is being pressed so tightly by the mantle all around it that it cannot melt. ACTIVITY: Thinking about the layers of the Earth. QUESTIONS: 1. What is the diameter of the Earth? Think of the Earth as acircle; then the diameter means the distance across the middle of the Earth. The diameter is 12 900 km. They can read this o the diagram. 2. The Earth is really a ball, so how deep can the hole be? Only 12 900 km, because after that the hole will come out of the other side of the Earth! 3. If the digging machine went as far as it can go, what is the last layer of the Earth that it would dig through? It will dig through the crust, but from underneath and then it will come out into the air. 4. Which is the best model of the Earth -aloaf of bread, an apple or an avocado? Look at the three pictures below. Which of those is most like the Earth? Explain your answer. Remember that the Earth has ahard crust, ahot sticky mantle and a hot core. Three dierent possible models of the layers of Earth. 92 Earth and Beyond
The bread has acrust, but no core. The apple has apeel or skin and acore, but the core is not one solid thing. The avocado has atough skin or peel, and asolid core, so it is quite a good model of the Earth. 5. Although the model you chose is most like the Earth, it is not exactly the same. In what way is this model not like the Earth? For example, the avocado pip is not hot, but the core of the earth is very hot. Soil, air, water and sunlight support life on Earth Life on Earth exists on the very thin layer around the planet -the crust. The soil is athin layer and all the plants need soil to grow in. The plants use energy from the Sun to grow and they make the oxygen we and all the animals need to breathe. You already learnt about this in Life and Living. ACTIVITY: So what is under our feet? INSTRUCTIONS: 1. In the first activity at the beginning of this Chapter you drew pictures of yourself digging ahole into the Earth. You had to imagine you were making the hole as deep as ahole can be. 2. Perhaps you feel your picture is correct, or perhaps you want to change your idea about the Earth. 3. Look at those pictures now, and do the activity again. QUESTIONS: 1. If you could make a hole into the Earth, through the floor of your classroom, what would you find down in the Earth? 2. Imagine you have that machine that can dig as deep as you want. You drive this digging machine as far as it can go. What do you find? 3. Do anew drawing of yourself and the digging machine and the hole. Your drawing must show the hole that the machine makes if you let it go on until it cannot go further. Chapter 2. Surface of the Earth 93
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- Page 106 and 107: VISIT Rocks erode to form soil (vid
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- Page 132 and 133: Answer: Crust, mantle, core. 2. Wha
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Teacher's Note<br />
Iron melts at those temperatures, but the iron is being pressed so<br />
tightly by the mantle all around it that it cannot melt.<br />
ACTIVITY: Thinking about the layers of the Earth.<br />
QUESTIONS:<br />
1. What is the diameter of the Earth?<br />
Think of the Earth as acircle; then the diameter means the<br />
distance across the middle of the Earth. The diameter is<br />
12 900 km. They can read this o the diagram.<br />
2. The Earth is really a ball, so how deep can the hole be?<br />
Only 12 900 km, because after that the hole will come out of<br />
the other side of the Earth!<br />
3. If the digging machine went as far as it can go, what is the last<br />
layer of the Earth that it would dig through?<br />
It will dig through the crust, but from underneath <strong>and</strong> then it<br />
will come out into the air.<br />
4. Which is the best model of the Earth -aloaf of bread, an<br />
apple or an avocado? Look at the three pictures below.<br />
Which of those is most like the Earth? Explain your answer.<br />
Remember that the Earth has ahard crust, ahot sticky<br />
mantle <strong>and</strong> a hot core.<br />
Three dierent possible models of the layers of Earth.<br />
92 Earth <strong>and</strong> Beyond
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