Classification – Earthquake vs volcano terms: three are earthquake-related terms; one is mainly volcanic. Find the odd one out. Options: Epicentre, Seismology, Focus, Crater.

Introduction / Context:
Physical geography often uses overlapping vocabulary. Separating earthquake terminology from volcanic features provides a clean classification axis.

Given Data / Assumptions:

• Epicentre: surface point above the earthquake focus.
• Focus (hypocentre): subterranean origin point of an earthquake.
• Seismology: scientific study of earthquakes/seismic waves.
• Crater: bowl-shaped volcanic or impact depression; primarily a volcano-related surface feature in this context.

Concept / Approach:
Group terms by the natural process they describe: earthquake vs volcano.

Step-by-Step Solution:
Epicentre → earthquake.Focus → earthquake.Seismology → earthquake science.Crater → volcanic/impact feature; not specific to earthquakes.

Verification / Alternative check:
Introductory earth-science glossaries align epicentre/focus/seismology with seismology and earthquakes, while crater is emphasized in volcanology.

Why Other Options Are Wrong:
Epicentre/Seismology/Focus: All belong to earthquake vocabulary.

Common Pitfalls:
Assuming any ground depression after quakes is a “crater”; earthquake surface ruptures are faults/fissures, not craters.

Final Answer:
Crater