Volcanoes that have not erupted for a very long time but may erupt at future time are termed as

Analyze the question The question asks for the term used for volcanoes that haven't erupted for a long time but could still erupt in the future.

Explain the concept Volcanoes are classified by how likely they are to erupt:

• Active volcano: Erupting now, or has erupted recently (in historic times) and is expected to erupt again. Examples: Mount Etna, Mount Vesuvius.
• Dormant volcano: "Sleeping." It has not erupted for a very long time, but it is still capable of erupting in the future. Example: Mount Fuji (often cited).
• Extinct volcano: It is not expected to erupt again. Example: Mount Kilimanjaro's Kibo cone is sometimes treated as dormant, while many old volcanic peaks are extinct.

"Extrusive" and "intrusive" are not volcano classifications. They describe igneous rocks and landforms:

• Extrusive: Magma cools on the Earth's surface (e.g., basalt, lava flows).
• Intrusive: Magma cools beneath the surface (e.g., granite, batholiths, dykes, sills).

Step-by-step solution

1. The key phrase is "have not erupted for a very long time", so it is not currently erupting. That rules out active (D).
2. The phrase "may erupt at a future time" means it is not dead, so it is not extinct (not offered anyway).
3. "Extrusive" and "intrusive" refer to rock or landform formation, not volcano status, so A and C are out.
4. The term that fits is dormant.

Answer: B. dormant

Exam tip Link the word to its meaning: dormant = sleeping (think "dorm", where you sleep). A sleeping volcano can wake up. Extinct means dead, and active means awake and erupting.