Science 4 · Unit 4: Earth and its habitats · Cambridge Primary Science Stage 4

Questions

1. 1. When a volcano erupts, magma comes from the ...

   • mantle
   • crust
   • core
   • ocean
   Check

2. 2. Magma reaches the surface through a crack in the ...

   • core
   • mantle
   • crust
   • ash
   Check

3. 3. What is magma called when it reaches the surface?

   • lava
   • ash
   • crust
   • mantle
   Check

4. 4. Sometimes lava and ... come out of a volcano.

   • water
   • metal
   • ice
   • ash
   Check

5. 5. Layers of lava and ash build up a cone-shaped mountain called a ... volcano.

   • flat
   • composite
   • runny
   • black
   Check

6. 6. When the lava is very runny, how does it move over the surface?

   • quickly
   • slowly
   Check

7. 7. Which islands were formed by very runny lava?

   • the British Isles
   • Sri Lanka
   • Hawaii
   • Madagascar
   Check

8. 8. When runny lava cools, what colour rocks does it form?

   • black
   • white
   • red
   • yellow
   Check

9. 9. Why is the area around the Pacific Ocean called the Ring of Fire?

   • The Sun sets over the Pacific Ocean.
   • The Pacific Ocean is very hot.
   • A ring of many active volcanoes goes round the Pacific Ocean.
   • There are forest fires all round the Pacific.
   Check

10. 10. Why do some parts of the world have lots of volcanoes and others have none?

    • Volcanoes form where the Earth's crust is cracked or thin.
    • Volcanoes form only in hot countries.
    • Volcanoes form only near big cities.
    • Volcanoes form where it rains a lot.
    Check

11. 11. Which of these comes first when a composite volcano erupts?

    • A secondary cone develops on the side.
    • Ash forms a layer on the volcano.
    • A crack forms in the crust, and magma travels up it to the surface.
    • A mountain of lava and ash layers forms.
    Check

12. 12. After magma reaches the surface, what flows out of the crater and down the sides?

    • magma
    • metal
    • lava
    • water
    Check

13. 13. What forms on top of the lava layer when a composite volcano erupts?

    • a layer of metal
    • a layer of soil
    • a layer of ice
    • a layer of ash
    Check

14. 14. How does a composite volcano mountain get built up?

    • from layers of lava and ash, one on top of another
    • from one big flow of runny lava
    • from soil washed down by rivers
    • from the inner core pushing up
    Check

15. 15. Which of these happens near the end, when a composite volcano erupts?

    • Magma travels up through the crust.
    • Magma moves in the mantle.
    • A side vent forms, and a secondary cone develops on the side of the volcano.
    • A crack forms in the crust.
    Check