Which of the following statements regarding the lahars of Nevado del Ruiz in Columbia is true?
A) The 1985 lahars that killed 22,000 people in the city of Armero were unprecedented and a complete surprise.
B) The potential danger to Armero was not included in a hazards map published before this tragic event.
C) The 1985 lahars were a virtual rerun of the events of 1845 and 1595 with the same places buried by the same types of lahars.
D) The 1985 lahars that buried the city of Armero were the result of volcanic weather due to an ultra-Plinian eruption.
Correct Answer:
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