This photograph was taken in 1989, 9 years after Mount Saint Helens erupted. Compare this photo with the 1983 photo. What has changed? What looks different? How do you think those changes might have come about?

Answer 1

Unfortunately, the given photographs are not provided to accurately assess the changes between 1983 and 1989. However, I can provide you with some general information about the changes that might have occurred in the aftermath of the Mount St. Helens eruption in 1980.

1. Landscape: After the eruption, the landscape would have undergone noticeable changes. In 1980, the top of the volcano was blown off, resulting in the destruction of surrounding forests and the formation of a large crater. Over time, vegetation might have started to regrow, gradually changing the appearance of the landscape.

2. Debris and Ash: Immediately following the eruption, the area around Mount St. Helens would have been filled with extensive debris and ash deposits. By 1983, some of the debris might have been removed through environmental processes or human activities, leading to a slightly cleaner and less disrupted environment.

3. Volcanic Dome: The volcano began to form a lava dome after the eruption, resulting in the growth of a large mound within the crater. Between 1983 and 1989, the size and shape of the dome might have changed as further volcanic activity occurred. The dome could have grown or eroded due to subsequent eruptions or weathering processes.

4. Plant Succession: By 1989, the process of plant succession would have been well underway. Initially, pioneer species such as grasses and shrubs would have colonized the barren landscape. By 1989, more advanced plants like small trees might have begun to establish themselves, leading to a greener appearance in comparison to the 1983 photo.

5. Animal Recovery: Following the eruption, many animals were displaced or killed. Therefore, by 1989, certain species might have started to repopulate the area. The presence of animals, the return of bird species, or evidence of mammal activity might be visible in the 1989 photo, showing a recovering ecosystem.

It's important to note that these are general assumptions based on the typical progression of ecological recovery following a volcanic eruption. The actual changes between the 1983 and 1989 photos could vary depending on factors such as subsequent volcanic activity, weather patterns, and human interventions.