Q11 -14:
Rocks can be catagorised as metamorphic, sedimentary and igneous.

Which of these is..

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11. .. produced by extreme heat and pressure deep within the Earth?

12. .. made by cooling lava / magma after a vocalnic erruption?

13. .. made at the bottom of the sea when layers of sand are compressed over millions of years?

14. .. diamond?

15. The Earth's continents are thought to lie on large 'plates' on the Earth's crust that move slowly. These are called..

• A. magma plates
• B. tectonic plates
• C. convection plates
• D. crustal plates

16. When one plate moves underneath another, the friction can cause...

• A. earthquakes and volcanos
• B. earthquakes and hurricanes
• C. hurricanes and tsunamis
• D. volcanos and heat waves

17. Hot rocks inside the Earth's mantle are thought to slowly rise to the surface. Cold regions sink downwards. These movements are called..

• A. magma plates
• B. magma movement
• C. convection currents
• D. radiative drift

18. The amethyst crystals shown here are large. To create them, what process needs to occur?

• A. cold solid rocks need to be heated rapidly
• B. cold solid rocks need to be heated slowly
• C. hot molten rocks need to be cooled rapidly
• D. hot molten rocks need to be cooled slowly