Answer:When magma has a high viscosity, it is most likely to erupt explosively. The high viscosity means that the magma is thick and sticky, and it has a tendency to trap gases within it. As the magma rises towards the surface, the pressure decreases, causing the gases to expand and create pressure. If the magma is too viscous, the gases may not be able to escape easily, leading to a build-up of pressure that can result in explosive eruptions. These types of eruptions can be very dangerous, producing ash, rocks, and gases that can be thrown hundreds of miles from the volcano. Examples of volcanoes that are known for producing explosive eruptions due to high viscosity magma include Mount St. Helens in the United States and Mount Pinatubo in the Philippines.
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