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1. Name the parts of the earth
• Core Inner/Outer
• Mantle
• Crust
2. Alfred Wegener put forward the idea of continental drift and that the continents existed as one super continent. What evidence did he have?
• Shape of the continents look like they could fit together like a jigsaw puzzle
• Fossils from different continents matched up.
3. Why were his ideas not accepted?
• Not enough evidence
• The believed the earth was shrinking as it cooled.
4. What are the names of the plates making up the earth’s crust?
• Tectonic plates
5. What causes them to move?
• Convection currents in the mantle
6. What causes the convection currents?
• Radioactive processes in the core cause the mantle to heat up causing the convection currents
7. Why can scientists not predict where and when earthquakes occur?
• The changes occur inside the earth’s mantle which scientists cannot measure.
8. The composition of the atmosphere has been has been much the same as it is today. What is the composition of the atmosphere?
• About 78% Nitrogen
• About 21% Oxygen
• Small proportions of carbon dioxide water vapour and argon
9. What is thought to have created the early atmosphere?
• Intense volcanic activity released gasses that formed the early atmosphere
• And water vapour that condensed to form the oceans
10. What was the composition of the early atmosphere?
• Mainly Carbon Dioxide
• Water vapour
• Small proportions of methane and ammonia
• Little or no oxygen
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