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PIMSO 2022 - Science - Grade 5 - National Round Question 21

PIMSO Science · PIMSO 2022 - Science - Grade 5 - National Round

Question 21

Which of the following is true about the process leading to a volcanic eruption?
  1. When tectonic plates move towards each other, magma rises in the gap between the plates.
  2. When temperature declines, old magma sinks to the bottom of the chamber.
  3. Fresh magma is pushed further to the bottom of the chamber.
  4. Increase in external pressure triggers the eruption.
  5. None of the above