Hazard Assessment & Evacuation

Question 1

A class is debating whether to order the evacuation of Riverbend, a town built on the slopes of an active volcano. Which argument most fully reflects the ethical and political factors that should be considered in making this decision?

Accepted Answer

We should weigh the danger to residents’ lives against Riverbend’s cultural ties to the land and make sure low‑income families receive help and a fair say before any evacuation is ordered.

Answer

Because scientists say the volcano may erupt soon, the town should be evacuated immediately, regardless of any cultural or economic concerns.

Answer

Evacuating would be too expensive for the government, so it is better to keep the community in place even if the risk of eruption is high.

Answer

The decision should be made only by the national emergency agency, without consulting the people who live there, to avoid confusion.

Question 2

Mount Caldera erupted 150 years ago, then 80 years ago, and most recently 30 years ago. Which statement best shows how scientists use these eruption recurrence intervals to estimate the chance of the next eruption?

Accepted Answer

They calculate the average time between past eruptions (150‑80 = 70 years, 80‑30 = 50 years) and use that average (about 60 years) to gauge how likely an eruption is within a similar time span.

Answer

They assume the volcano will erupt exactly after the longest past interval of 70 years from now.

Answer

They ignore past intervals and decide the probability only from current earthquake counts.

Answer

They conclude the volcano is unlikely to erupt again because it has already erupted many times.

Question 3

Which of the following best explains how eruption recurrence intervals help scientists estimate the chance of a volcano erupting in the future?

Accepted Answer

They look at the average time between past eruptions and use that average to judge how likely an eruption is in the next few years, while remembering the intervals can vary.

Answer

They add up the total number of eruptions that have ever happened and divide by the volcano’s age to get a single probability.

Answer

They only measure the amount of gas the volcano is releasing now, because past eruption timing isn’t useful.

Answer

They assume the volcano will erupt exactly on the same schedule as the last eruption, without any variation.

Try three questions

A class is debating whether to order the evacuation of Riverbend, a town built on the slopes of an active volcano. Which argument most fully reflects the ethical and political factors that should be considered in making this decision?

Mount Caldera erupted 150 years ago, then 80 years ago, and most recently 30 years ago. Which statement best shows how scientists use these eruption recurrence intervals to estimate the chance of the next eruption?

Which of the following best explains how eruption recurrence intervals help scientists estimate the chance of a volcano erupting in the future?

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