Active, Dormant & Extinct

Question 1

Volcano Sleepy Hill has not erupted in 300 years, so the town council thinks it is safe to build a playground on its slopes. Which statement best explains why the playground might still be unsafe?

Accepted Answer

A dormant volcano can still erupt even after many years of quiet, so the area could become dangerous again.

Answer

Sleepy Hill is an extinct volcano, so it will never erupt and is completely safe.

Answer

The ground near the volcano is too rocky to hold playground equipment.

Answer

Volcanic ash makes the soil very fertile, which is why building a playground is a good idea.

Question 2

Scientists give three volcanoes these descriptions: 1. Volcano Emberlast erupted just 6 months ago. 2. Volcano Quietridge hasn’t erupted for 400 years, but underground sensors still show magma moving beneath it. 3. Volcano Oldfield has not erupted for 9,000 years, and rock studies show there is no magma left beneath it. Which volcano is correctly classified as extinct?

Accepted Answer

Volcano Oldfield

Answer

Volcano Emberlast

Answer

Volcano Quietridge

Answer

There is not enough information to decide

Question 3

Mount Calm hasn't erupted for 500 years, so scientists call it a dormant volcano. Which statement best explains why it is still not safe to camp right on its side?

Accepted Answer

Because the volcano could become active again even after a long quiet time.

Answer

Because the ground is too hot after not erupting for many years.

Answer

Because the nearby forest makes the area unsafe, not the volcano itself.

Answer

Because scientists say dormant volcanoes never erupt again.

Try three questions

Volcano Sleepy Hill has not erupted in 300 years, so the town council thinks it is safe to build a playground on its slopes. Which statement best explains why the playground might still be unsafe?

Mount Calm hasn't erupted for 500 years, so scientists call it a dormant volcano. Which statement best explains why it is still not safe to camp right on its side?

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