Question

How does the graph support the author's point that internal waves affect ocean water dynamics?

• A. It demonstrates that wave movement forces warmer water down to depths that typically are colder.
• B. It reveals the degree to which an internal wave affects the density of deep layers of cold water.
• C. It illustrates the change in surface temperature that takes place during an isolated series of deep waves.
• D. It shows that multiple waves rising near the surface of the ocean disrupt the flow of normal tides.

Answer 1

Answer: (A)

It demonstrates that wave movement forces warmer water down to depths that typically are colder.

In the first paragraph of the passage, the writer notes that the internal waves are “fundamental parts of ocean water dynamics”. This is so because they transfer “heat to the ocean depths and bring up cold water from below.” The graph, too, shows an internal wave forcing the warm isotherms to depths that typically are colder- at 13:12, the internal wave forces the 10°C, 11°C, and 13°C isotherms to depths that typically are colder and by doing so transfers heat to the oceans depth. In this context, what option A states is correct. The other options are incorrect because
the graph does not show any affect that the internal waves might have had on either ocean’s density; or surface temperature; or tide flow. So, A is correct.