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Expression of Ideas Difficulty: Easy

The liquid metals in Earth’s core circulate constantly, and this circulation generates electrical currents that flow between Earth’s North and South magnetic poles. These electrical currents, blank create a barrier around Earth that protects us from radiation and charged particles coming from space.

Which choice completes the text with the most logical transition?

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Explanation

Choice A is the best answer. "In turn" logically signals that the information in the sentence—that the electrical currents create a protective barrier around Earth—is a result or consequence of the previous information about the circulation of liquid metals generating electrical currents that flow between Earth’s magnetic poles.

Choice B is incorrect because "likewise" illogically signals that the information in the sentence is similar to the previous information about the circulation of liquid metals generating electrical currents that flow between Earth’s magnetic poles. Instead, the new information about the electrical currents is a direct result or consequence of the previous information. Choice C is incorrect because "nevertheless" illogically signals that the information in the sentence is true despite the previous information about the circulation of liquid metals generating electrical currents that flow between Earth’s magnetic poles. Instead, the new information about the electrical currents is a direct result or consequence of the previous information. Choice D is incorrect because "in reality" illogically signals that the information in the sentence contradicts the previous information about the circulation of liquid metals generating electrical currents that flow between Earth’s magnetic poles. Instead, the new information about the electrical currents is a direct result or consequence of the previous information.