The Grand Canyon is approximately 29 kilometers long. Mariner Valley is a canyon on Mars that is approximately 212 kilometers long. About how many times longer is Mariner Valley than the Grand Canyon? 1. 2
2. 2 to the power of 3
3. 2 to the power of 21
4. 2 to the power of 108

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        In this stanza, the character thinks there is someone at the door, from the faint tapping on his door. He awakes with the noise, and when he gets to the door, there is no one there.

        So, the way Edgar Allan Poe creates suspense is through the source of the noise that is not yet revealed, as no one is standing att the door.