Final answer:
The use of 'massive red walls' and 'low, dull murmur' to 'soft roar' are examples of sensory details that create a vivid setting in Tarshis's 'Mountain of Doom.'
Step-by-step explanation:
In the first paragraph of "Mountain of Doom," Tarshis creates a vivid sense of atmosphere by employing a range of sensory details. The mention of 'massive red walls growing higher and wilder' appeals to the visual sense, giving the reader a picture of the expanding, rugged terrain. Similarly, auditory details are woven into the text through the description of the 'low, dull murmur' which eventually becomes a 'soft roar', signifying the presence of falling water. These sensory details richly enhance the scene and draw the reader into the protagonist's experience within a dynamic natural setting.