9

Set 1: Central Ideas (Advanced)

Explanation

Answer: A

PASSAGE

The following text discusses Plate Tectonics and 'Continental Drift'. Alfred Wegener's hypothesis of continental drift, proposed in 1912, was initially met with skepticism because he lacked a mechanism for how continents could move through rigid oceanic crust. It wasn't until the discovery of seafloor spreading and paleomagnetism in the mid-20th century that the comprehensive theory of plate tectonics emerged. This theory posits that Earth's lithosphere is divided into plates that glide over the semi-fluid asthenosphere, driven by mantle convection, creating earthquakes, volcanoes, and mountain ranges at their boundaries.

Why was Wegener's hypothesis of continental drift initially rejected?

A. He relied on religious texts rather than scientific data✓ Correct
B. He lacked a plausible mechanism for the movement of continents
C. The fossil evidence he presented was proven to be forged
D. He could not explain the magnetic alignment of rocks

Detailed Explanation

Choice B is correct. The text states it was met with skepticism because 'he lacked a mechanism for how continents could move.'

Key Evidence:

• "lacked a mechanism"

• "initially met with skepticism"

Why others are wrong: A (Not mentioned), C (Not mentioned), D (This was the evidence that LATER proved him right (paleomagnetism)).

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