Question 65

Sea levels around the world are rising because water expands when it warms.

This inference identifies a fundamental assumption behind the phenomenon of rising sea levels related to climate change. It presupposes the scientific principle that thermal expansion of water contributes to this rise.

A) Warming ocean waters will put all fishers out of business.

This statement is more of a prediction than an assumption. It suggests a definitive outcome rather than an underlying premise that supports the logic of rising sea levels. Therefore, it is not classified as an assumption.

B) Sea levels around the world are rising because water expands when it warms.

This inference is indeed an assumption as it is based on the scientific understanding of thermal expansion, which is essential for linking ocean warming to rising sea levels. It reflects an accepted premise that underlies the discussion of climate change impacts on sea levels.

C) Ocean water is combining with water from melting land glaciers.

Although this statement describes an observable phenomenon, it does not function as an assumption. It simply states a fact rather than a foundational belief necessary for the argument about rising sea levels.

D) Rising sea levels are affecting coastlines and ecosystems in many places.

This choice reflects an effect rather than an assumption. It describes the consequences of rising sea levels rather than the underlying reasons or principles that explain why sea levels are rising in the first place.

Conclusion

The correct answer, B, is the only option that serves as an assumption, as it is based on the principle of thermal expansion, which is crucial for understanding the relationship between warming waters and rising sea levels. In contrast, the other options either predict outcomes, state facts, or describe effects rather than addressing the underlying assumptions that support the argument.