Part A
What does the phrase highly dynamic and variable indicate about the mountains and canyons of Yellowstone in the first sentence of paragraph 2?
• 1. They are extremely old features.
2. They are mainly why the park exists.
• 3. They are especially popular with visitors.
4. They are continually undergoing changes.
Part B
Which detail from the passage best supports the correct answer from Part A?
• 1. "processes over the last 150 million years" (Paragraph 1)
2. "define the natural wonder" (Paragraph 1)
3. "active volcanic, hydrothermal (water + heat), andearthquake systems" (Paragraph 2)
4. "extraordinary geysers, hot springs, mudpots and steam vents" (Paragraph 2)
1 answer
Part A: The phrase "highly dynamic and variable" indicates that the mountains and canyons of Yellowstone are continually undergoing changes. Therefore, the correct answer is:
4. They are continually undergoing changes.
Part B: The detail from the passage that best supports the answer from Part A is:
3. "active volcanic, hydrothermal (water + heat), and earthquake systems" (Paragraph 2)
This detail emphasizes the dynamic nature of the geological processes in Yellowstone.
