Science 6 · Unit 3: Rocks, the rock cycle and soil · Cambridge Primary Science Stage 6

Questions

1. 1. What does the word 'igneous' mean?

   • fire
   • layers
   • change
   • water
   Check

2. 2. How do igneous rocks form?

   • Sediments are squashed together.
   • Magma or lava cools and becomes solid.
   • Shells pile up on the sea bed.
   • Rocks are changed by heat and pressure.
   Check

3. 3. What is solidification?

   • when rock is weathered
   • when sediments are deposited
   • when magma cools and turns into a solid
   • when rock melts
   Check

4. 4. What is magma called when it comes out at the Earth's surface?

   • mica
   • lava
   • sediment
   • granite
   Check

5. 5. What does 'extrusive' mean?

   • formed deep inside the crust
   • formed under the sea from shells
   • formed outside the Earth's crust, on the surface
   • changed by pressure
   Check

6. 6. Which is an extrusive igneous rock?

   • sandstone
   • basalt
   • granite
   • marble
   Check

7. 7. Which is an intrusive igneous rock?

   • slate
   • granite
   • shale
   • basalt
   Check

8. 8. Why does granite have large crystals?

   • The lava cooled quickly.
   • The magma cooled slowly deep underground.
   • It was made of shells.
   • It was squashed by pressure.
   Check

9. 9. Why are basalt's crystals too small to see?

   • It contains no minerals.
   • The lava cooled quickly on the surface.
   • It cooled very slowly.
   • It is a sedimentary rock.
   Check

10. 10. What is the most important characteristic of all igneous rocks?

    • They are in layers.
    • They contain fossils.
    • They are soft.
    • They are crystalline.
    Check

11. 11. Which minerals are in granite?

    • shells and sand
    • clay and loam
    • salt and sugar
    • quartz, feldspar and mica
    Check

12. 12. Quartz is made of which substances?

    • salt and water
    • silicon and oxygen
    • iron and copper
    • carbon and gold
    Check

13. 13. In granite, which mineral forms black shiny crystals?

    • salt
    • feldspar
    • mica
    • quartz
    Check

14. 14. Salt crystals are grown in a warm jar and a cold fridge jar. Which models an intrusive igneous rock?

    • neither
    • the fridge jar, where crystals form fast
    • both the same
    • the warm jar, where crystals grow slowly and large
    Check

15. 15. Black smooth stones lie on a beach of an island with a big volcanic mountain. Are they granite or basalt?

    • granite
    • basalt
    Check

16. 16. What are geologists?

    • doctors
    • scientists who study animals
    • scientists who study rocks
    • scientists who study stars
    Check