Science Olympiad Dynamic Planet Practice Test

What is a characteristic of monogenetic volcanic fields?

1. They consist of one large volcano only

2. They are formed from multiple short-lived volcanic eruptions

3. They are synonymous with large continental volcanoes

4. They have continuous volcanic activity

The correct answer is: They are formed from multiple short-lived volcanic eruptions

Monogenetic volcanic fields are defined by their formation through a series of short-lived volcanic eruptions, which typically create a variety of smaller volcanic features such as scoria cones and lava flows rather than one large central volcano. Each eruption in these fields is generally isolated and produces a specific volcanic structure that represents just a single event in the area's geological history. This characteristic sets monogenetic fields apart from polygenetic volcanic systems, which can have a long-lived volcanic center that erupts multiple times over an extended period. In contrast, the other options misrepresent the nature of monogenetic volcanic fields. For example, stating that they consist of one large volcano fails to capture the fact that their defining feature is the presence of multiple, smaller formations. Additionally, being synonymous with large continental volcanoes overlooks the fact that monogenetic fields typically involve numerous smaller eruptions and varied volcanic landforms. Lastly, the concept of continuous volcanic activity does not apply, as these fields are characterized by sporadic eruptions rather than a sustained volcanic presence. Thus, the defining aspect of monogenetic volcanic fields being formed from multiple short-lived eruptions is accurately represented in the correct answer.