Which statement best describes secondary effects?

• A. They are the knock-on results of the primary effects
• B. They are the direct results of the hazard
• C. They are predicted outcomes
• D. They are long-term changes

Answer: (A)

Secondary effects are the knock-on results that follow the initial impacts of a hazard. When the primary effects occur—like ground shaking in an earthquake or lava flow in a volcanic eruption—the secondary effects are the indirect consequences that arise because of that damage, such as fires from ruptured gas lines, tsunamis triggered by seabed movement, landslides that block roads, or outbreaks of disease due to disrupted infrastructure. This is why describing secondary effects as the knock-on results of the primary effects fits best: they are caused by the initial damage rather than being the immediate impact itself. They can become long-term issues, but the defining idea is the causal chain from the primary effects to subsequent consequences.