passwella.
Menu

UI Post-UTME Geography 2017 (Model questions) Question 2

Question 2

Earth Movements and Vulcanicity

A volcanic eruption is most likely to be violent when

  1. A.volcano is near the sea
  2. B.neck of the volcano is sealed by a plug
  3. C.lava is viscous
  4. D.lava reaches the surface through a fissure
  5. E.volcano is below an ocean
Show the answer and explanation

Answer: C (lava is viscous)

Explanation

Thick (viscous) lava traps gas, so pressure builds until it bursts out explosively.