Explain:
The lava dome of Mt. St. Helens has undergone several changes since its formation. Here are some key statements that describe these changes:
1. Initially, the lava dome formed as a result of the eruption in 1980, which caused a massive explosion and the collapse of the volcano's north flank.
2. Over time, the lava dome grew in size as magma slowly rose to the surface and solidified. This resulted in a prominent dome-shaped feature at the volcano's summit.
3. As the lava dome continued to grow, it became unstable due to the pressure of the rising magma. This led to frequent small-scale eruptions and the release of volcanic gases, steam, and ash.
4. In 2004, a larger eruption occurred, resulting in the partial collapse of the lava dome. This event reduced the dome's overall size and altered its shape.
5. Since then, the lava dome has continued to slowly grow and change. It undergoes periodic eruptions and collapses, which contribute to its ongoing evolution.
Overall, the lava dome of Mt. St. Helens has changed in size, shape, and stability over time, influenced by the volcano's ongoing volcanic activity. It serves as a dynamic reminder of the volcanic processes occurring beneath the surface.
