Question

old faithful is a cone geyser in yellowstone national park. a geyser is a natural fountain that shoots hot water into the air. many tourists and scientists visit old faithful every year. old faithful is known for erupting water and steam at regular intervals. for eruptions that last about two minutes, it will spurt about every hour. for eruptions that last about four minutes, it will spurt about every hour and a half. old faithful will spray water from about 100 to 200 feet in the air. the geyser’s water and steam come from underground. earthquakes affect how often old faithful will erupt. what would be the best concluding sentence for this passage? a. a group of people discovered old faithful in wyoming in 1870. b. steamboat geyser can spray water about 300 feet in the air. c. hot springs are like geysers, but hot springs don’t erupt water. d. old faithful is one of the most famous geysers in the world.

Explanation:

The passage focuses on Old Faithful's features like eruptions, water spray height, and how earthquakes affect it. A concluding sentence should summarize its significance. Option A is about discovery time and place, which is not a summary. Option B introduces Steamboat Geyser, which is off - topic. Option C compares hot springs and geysers, not relevant to Old Faithful's summary. Option D summarizes Old Faithful's fame, which fits as a conclusion.

Answer:

D. Old Faithful is one of the most famous geysers in the world.