What's covered
Earth's atmosphere10
Earth's structure and rocks8
Sample questions
A taste of the 18 questions in this topic — answers marked. Sign up to practise the full set with spaced repetition.
1Earth's atmosphere
What gas makes up about 78% of the atmosphere?
- •Argon
- •Carbon dioxide
- ✓Nitrogen
- •Oxygen
2Earth's structure and rocks
What are the three rock types?
- •Hard, soft, medium
- ✓Igneous, sedimentary, metamorphic
- •Limestone, sandstone, clay
- •Volcanic, oceanic, lake
3Earth's atmosphere
What gas makes up about 21% of the atmosphere?
- •CO₂
- •Helium
- •Nitrogen
- ✓Oxygen
4Earth's structure and rocks
How is igneous rock formed?
- •Heat and pressure change existing rock
- •Layers of sediment compress over time
- ✓Molten rock cools and solidifies
- •Rivers deposit minerals in lakes
5Earth's atmosphere
Which greenhouse gas is added by burning fossil fuels?
- •Argon gas
- ✓Carbon dioxide
- •Hydrogen gas
- •Nitrogen gas
6Earth's structure and rocks
How is sedimentary rock formed?
- •Heat and pressure transform rock
- ✓Layers of sediment compress over time
- •Molten rock cools quickly
- •Rocks break apart in water
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