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 Note that the mould has been turned upside down to get this out. 10. Now give your "rock" to another group and get a dierent rock from them. Do not tell the other group what fossil is in your "rock". 11. Use the knife to tap gently on the edge of the "rock". Use a stick to tap on the back of the knife blade, so that you do not hit too hard. You should find a cast of the bone. 12. Your "rock" should split open if you tap in the right place. When it splits open, you will see a cast of aleaf or abone on the top layer. The cast has the shape of the impression, but the impression goes inward and the cast stands up. QUESTIONS: 1. Look carefully at the cast and try to draw the leaf or the bone as it really was. 2. Try to work out what kind of plant the leaf came from, or what kind of animal the bone came from. 3. Is the cast (the shape) really a bone, or really a leaf? No, it has kept the shape of the bone or leaf. 148 Earth and Beyond
4. Do you remember learning about plaster of Paris in the second term in Matter and Materials? What properties of plaster of Paris make it useful in this activity? The plaster of paris is first wet and soft when you first mix the powder and water together. This is useful as it allows you to mould the plaster of paris around the bone as the mud from long ago would have done. The plaster of paris then sets and becomes very hard just as the mud and rock did over time. This is useful as it forms a cast of the bone which is hard and set. Now that you have seen an impression of an object can be made by using Plaster of Paris, let's have a closer look at how a dinosaur fossils were made millions of years ago. Look at the pictures below and read the explanations for each stage of the fossil formation process. Long, long ago, a dinosaur dies on the banks of ariver, such as this triceratops in the picture. The flesh of the dinosaur decomposes, or other animals eat it. So, only the skeleton remains. Chapter 4. Fossils 149
- Page 106 and 107: 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 158 and 159: There was a flood and the river ros
- 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
Teacher's Note<br />
Note that the mould has been turned upside down to get this out.<br />
10. Now give your "rock" to another group <strong>and</strong> get a dierent<br />
rock from them. Do not tell the other group what fossil is in<br />
your "rock".<br />
11. Use the knife to tap gently on the edge of the "rock". Use a<br />
stick to tap on the back of the knife blade, so that you do not<br />
hit too hard.<br />
You should find a cast of the bone.<br />
12. Your "rock" should split open if you tap in the right place.<br />
When it splits open, you will see a cast of aleaf or abone on<br />
the top layer. The cast has the shape of the impression, but<br />
the impression goes inward <strong>and</strong> the cast st<strong>and</strong>s up.<br />
QUESTIONS:<br />
1. Look carefully at the cast <strong>and</strong> try to draw the leaf or the bone<br />
as it really was.<br />
2. Try to work out what kind of plant the leaf came from, or what<br />
kind of animal the bone came from.<br />
3. Is the cast (the shape) really a bone, or really a leaf?<br />
No, it has kept the shape of the bone or leaf.<br />
148 Earth <strong>and</strong> Beyond
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