Natural Sciences and Technology Grade 5-B ... - Thunderbolt Kids

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There was a flood and the river rose and covered the skeleton with mud and sand. Over time, more floods deposit more layers of sand and mud over the skeleton. Over thousands of years, the bottom layers start to become compacted and turn into sedimentary rock. Under the ground, water carried substances from rock into each little space where a bone had been. Rock took the place of bone. We say the bones were fossilised. A fossil bone has the same shape as the original bone but much heavier. Millions of years later, the conditions of the environment above the skeleton may change. The rock is eroded and weathered over time by wind and water and the fossil is exposed on the surface. A scientist sees the fossil and agreat discovery is made! 150 Earth and Beyond
Other scientists join in and they excavate the fossil by carefully removing the rock and sand around the skeleton. The fossils will be carefully packed and taken to a museum or research centre where the scientists will study them to see what they can learn about prehistoric life. They will try to reassemble the bones into a full skeleton - this may take many months to do! 4.2 Body and trace fossils We have seen many dierent fossils so far in this chapter. These fossils can be divided into two groups: 1. Body fossils 2. Trace fossils A body fossil shows you the shape of the body of the plant or animal. Body fossils include teeth, bones, shells, stems, leaves and seeds. Sometimes an animal left only asign that it has been there. For example, if you walk across wet cement, you might leave a footprint which will be preserved in the cement when it hardens. Look at the picture below. Chapter 4. Fossils VISIT Fossilization video. goo.gl/b906Z 151
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Natural Sciences and Technology Gra
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AUTHORS LIST This book was written
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THE NATURAL SCIENCES AND TECHNOLOGY
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Matter and Materials and Structures
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1 Stored energy in fuels 4 KEY QUES
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VISIT How fossil fuels are made. go
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So we can say that food is the fuel
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MATERIALS: • various packaging fo
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Coal is not only burnt in our homes
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2. Remove both ends of the large ca
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QUESTIONS: 1. Which fuel contained
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INVESTIGATION: What happens when af
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VISIT Burning substances in air and
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3. Write a description next to each
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3. What causes of fire can you iden
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3. Some points to think about when
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1. Describe the relationship betwee
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2 Energy and electricity 30 KEY QUE
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When the electrical energy is trans
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A car needs energy to start its eng
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Huge pylons carrying the transmissi
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ACTIVITY: 10 Safety tips for electr
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KEY CONCEPTS Never stick a metal kn
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3 Energy and movement 42 KEY QUESTI
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2. Tie another elastic band around
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QUESTIONS Look up adefinition for p
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5. Place it in the water, and let i
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QUESTIONS Use your knowledge of spr
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4 Systems for moving things 52 KEY
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Teacher's Note You can demonstrate
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QUESTIONS Label the two wheels and
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4. Place a few marbles or some othe
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6. Repeat this for the other 2wheel
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The board makes bearings for the ax
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INSTRUCTIONS: Things you can use fo
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REVISION: 1. List four dierent vehi
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1 Planet Earth 70 KEY QUESTIONS •
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• The Earth spins right around in
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3. Was it daytime in Saudi Arabia?
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VISIT Short video showing the sun,
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The planets move in orbits around t
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MATERIALS: • 100m heavy string
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Teacher's Note Make sure to point o
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2 Surface of the Earth 84 KEY QUEST
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QUESTIONS: 1. What is under the flo
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Imagine we could cut aslice out of
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QUESTIONS 1. If you dig ahole in th
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Teacher's Note Iron melts at those
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The hole will come to of the other
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Look at the place where the water h
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VISIT Rocks erode to form soil (vid
Page 108 and 109: ACTIVITY: Make a model of acid wate
Page 110 and 111: ACTIVITY: Look at dierent kinds of
Page 112 and 113: MATERIALS: • 3 big cool drink bot
Page 114 and 115: In the beginning, you might think t
Page 116 and 117: The topsoil has gone from this land
Page 118 and 119: INSTRUCTIONS: 1. Collect two tins o
Page 120 and 121: QUESTIONS 1. Can you make pots with
Page 122 and 123: VISIT Interesting website about soi
Page 124 and 125: QUESTIONS: 1. Are the drops on the
Page 126 and 127: Set up the soils as you see in the
Page 128 and 129: Which soil type do plants grow best
Page 130 and 131: Average height grown by seedlings i
Page 132 and 133: Answer: Crust, mantle, core. 2. Wha
Page 134 and 135: 3 Sedimentary rocks VISIT Dierent r
Page 136 and 137: Sediments When the sand grains coll
Page 138 and 139: 2. Which is the oldest sediment? Th
Page 140 and 141: Look at the layers in the sedimenta
Page 142 and 143: This is how the mountains look now.
Page 144 and 145: A sculpture made from limestone. 10
Page 146 and 147: Cement is also made from shale. The
Page 148 and 149: 4 Fossils 140 KEY QUESTIONS • Wha
Page 150 and 151: VISIT When a T-Rex attacks! (video)
Page 152 and 153: VISIT How are fossils formed? goo.g
Page 154 and 155: Teacher's Note Of course, it's much
Page 156 and 157: Teacher's Note Note that the mould
Page 160 and 161: A footprint which has hardened in t
Page 162 and 163: Do you know where this is in South
Page 164 and 165: VISIT Finding the coelacanth (video
Page 166 and 167: I just love learning more and more
Page 168 and 169: ACTIVITY: Thinking about the Cradle
Page 170 and 171: REVISION: 1. Are animal fossils mad
Page 172 and 173: 5 Notes 164 Chapter 1 Stored energy
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Natural Sciences and Technology Grade 5-B ... - Thunderbolt Kids

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