Question

It was such a gradual movement that he discovered it only through noticing that a black mark that had been near him five minutes ago was now at the other side of the circumference. Even then he scarcely understood what this indicated, until he heard a muffled grating sound and saw the black mark jerk forward an inch or so. Then the thing came upon him in a flash. The cylinder was artificial—hollow—with an end that screwed out! Something within the cylinder was unscrewing the top!

In this excerpt, Wells entertains readers by

providing researched facts.
using vivid sensory details.
citing the cylinder's dimensions.
offering convincing arguments.

Answer 1

using vivid sensory details.

The passage relies on visual and auditory details ("black mark," "muffled grating sound," "jerk forward," "came upon him in a flash") to engage the reader and build suspense.