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

Questions

1. 1. What are sedimentary rocks made from?

   • small pieces of other rocks stuck together
   • cooled magma
   • rocks changed by heat and pressure
   • pure crystals
   Check

2. 2. What is weathering?

   • rocks being carried by rivers
   • sediments being squashed
   • magma cooling
   • rocks being broken up by heat, cold, rain or plant roots
   Check

3. 3. What does a river do to weathered rock?

   • erodes it into sediments and transports them
   • melts it
   • turns it into magma
   • makes crystals
   Check

4. 4. What is sedimentation?

   • lava cooling
   • rocks being weathered
   • rocks melting
   • sediments being deposited in layers
   Check

5. 5. What is the correct order for sedimentary rock formation?

   • weathering, eroding, transporting, depositing, sedimentation
   • transporting, depositing, weathering, eroding, sedimentation
   • depositing, weathering, eroding, sedimentation, transporting
   • sedimentation, eroding, weathering, transporting, depositing
   Check

6. 6. What is an important characteristic of sedimentary rocks?

   • They are always black.
   • They form in layers.
   • They have large shiny crystals.
   • They are made of magma.
   Check

7. 7. Which sedimentary rock is made of sand grains stuck together?

   • sandstone
   • shale
   • limestone
   • granite
   Check

8. 8. Which sedimentary rock is made from layers of shells?

   • basalt
   • sandstone
   • limestone
   • shale
   Check

9. 9. Which sedimentary rock is fine-grained, grey and soft enough to break with your hands?

   • sandstone
   • shale
   • quartzite
   • limestone
   Check

10. 10. Why is most sand made of quartz?

    • Quartz is made of shells.
    • Quartz dissolves in water.
    • Quartz is soft.
    • Quartz is very hard and resists weathering.
    Check

11. 11. What are fossils?

    • living animals
    • preserved remains of animals and plants in sedimentary rocks
    • cooled lava
    • crystals in granite
    Check

12. 12. Why are fossils only found in sedimentary rocks?

    • Fossils form in magma.
    • Metamorphic rocks are too soft.
    • The animal must be buried quickly in sediment with little air.
    • Igneous rocks are too cold.
    Check

13. 13. What is a fossil mould?

    • a crystal
    • a whole animal turned to stone
    • an imprint left by an animal or plant in sediment
    • a kind of soil
    Check

14. 14. What is a fossil cast?

    • a living animal
    • a mould that filled with minerals that hardened
    • an empty imprint
    • a piece of granite
    Check

15. 15. In the plasticine and plaster model fossil, what does the plaster of Paris represent?

    • the animal's bones
    • minerals that fill the mould to make a cast
    • the sea water
    • the sun
    Check

16. 16. How do scientists know animals in a fossil park are now extinct?

    • The fossils are very small.
    • The fossils don't match any animals alive today.
    • The animals told them.
    • They found living ones.
    Check