Q1-4:
The diagram below shows the internal structure of the Earth.
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1. What is the name given to layer X?
- A. The crust
- B. The middle core
- C. The mantle
- D. The metamorphic layer
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2. What is the name given to layer Y?
- A. The crust
- B. The middle core
- C. The mantle
- D. The metamorphic layer
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3. Which layer is thought to be liquid?
- A. The atmosphere
- B. The outer core
- C. The mantle
- D. The inner core
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4. Which layer(s) are thought to contain mostly iron and nickel?
- A. The crust
- B. The outer and inner core
- C. The mantle and outer core
- D. The mantle
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5. The Earth's atmosphere contains oxygen, which we breathe. Which of the answers below gives the approximate percentage of oxygen in the atmosphere?
- A. 10%
- B. 20%
- C. 30%
- D. 40%
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6. Which gas is the most abundant in the Earth's atmosphere?
- A. oxygen
- B. argon
- C. carbon dioxide
- D. nitrogen
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Q7-8.
Scientists are worried about global warming. As we burn fossil fuels, we are trapping more heat energy in the atmosphere.
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7. Which gas is released into the atmosphere when we burn fossil fuels?
- A. carbon dioxide
- B. oxygen
- C. methane
- D. hydrogen
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8. The process of some gases 'trapping' infrared heat in the atmosphere is called..
- A. insulation
- B. the greenhouse effect
- C. the ozone layer
- D. the convection cycle
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9. One process that can remove carbon dioxide from the atmosphere is..
- A. respiration from living things
- B. photosynthesis
- C. burning renewable resources like wood
- D. the effect of sunlight
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10. Fossil fuels like coal and oil are all part of the carbon cycle. The source of carbon in fossil fuels is..
- A. the Sun
- B. volcanic gas emissions
- C. sedimentary rocks
- D. fossilised plants and animals
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